Coordination Compounds

The correct sequence of ligands in the order of decreasing field strength is :

Match List-I with List-II:

Choose the correct answer from the options given below:

Which of the following complex is homoleptic?

[JEE Main 2024, 1 Feb (Shift 1)]

The metal atom present in the complex MABXL (where A, B, X and L are unidentate ligands and M is metal) involves \(s{p}^{3}\) hybridization. The number of geometrical isomers exhibited by the complex is :

[JEE Main 2024, 05 Apr (Shift 2)]

The metal atom present in the complex MABXL (where A, B, X and L are unidentate ligands and M is metal) involves \(s{p}^{3}\) hybridization. The number of geometrical isomers exhibited by the complex is :

[JEE Main 2024, 05 Apr (Shift 2)]

The coordination environment of \(C{a}^{2+}\) ion in its complex with \(EDT{A}^{4-}\) is :
[JEE Main 2024, 09 Apr (Shift 2)]

The coordination environment of \(C{a}^{2+}\) ion in its complex with \(EDT{A}^{4-}\) is :
[JEE Main 2024, 09 Apr (Shift 2)]

Number of ambidentate ligands among the following is _____

\({\mathrm{NO}}_{2}^{-},{\mathrm{SCN}}^{-},{\mathrm{C}}_{2}{\mathrm{O}}_{4}^{2-},{\mathrm{NH}}_{3},{\mathrm{CN}}^{-},{\mathrm{SO}}_{4}^{2-},{\mathrm{H}}_{2}\mathrm{O}\)

[JEE Main 2024, 09 Apr (Shift 1)]

Number of ambidentate ligands among the following is _____

\({\mathrm{NO}}_{2}^{-},{\mathrm{SCN}}^{-},{\mathrm{C}}_{2}{\mathrm{O}}_{4}^{2-},{\mathrm{NH}}_{3},{\mathrm{CN}}^{-},{\mathrm{SO}}_{4}^{2-},{\mathrm{H}}_{2}\mathrm{O}\)

[JEE Main 2024, 09 Apr (Shift 1)]

The type of hybridization and the magnetic property of \({\left[{\mathrm{MnCl}}_{6}\right]}^{3-}\) are

[JEE Main 2025, 2 Apr (Shift 2)]

Consider the following low-spin complexes

\({K}_{3}\left[Co{\left(N{O}_{2}\right)}_{6}\right],{K}_{4}\left[Fe(CN{)}_{6}\right],\) \({K}_{3}\left[Fe(CN{)}_{6}\right],C{u}_{2}\left[Fe(CN{)}_{6}\right]\) and \(Z{n}_{2}\left[Fe(CN{)}_{6}\right].\)

The sum of the spin-only magnetic moment values of complexes having yellow colour is _________ B.M. (answer in nearest integer)

[JEE Main 2025, 29 Jan (Shift 2)]

The correct increasing order of stability of the complexes based on \({\Delta }_{0}\) value is
I. \({\left[Mn(CN{)}_{6}\right]}^{3-}\)
II. \({\left[Co(CN{)}_{6}\right]}^{4-}\)
III. \({\left[Fe(CN{)}_{6}\right]}^{4-}\)
IV. \({\left[Fe(CN{)}_{6}\right]}^{3-}\)
[JEE Main 2025, 29 Jan (Shift 1)]

When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be :

[JEE Main 2025, 24 Jan (Shift 2)]

The correct sequence of ligands in the order of decreasing field strength is :

A metal complex with a formula \(\mathrm{MC}{l}_{4}\cdot 3{\mathrm{NH}}_{3}\) is involved in \({\mathrm{sp}}^{3}{\mathrm{d}}^{2}\) hybridisation. It upon reaction with excess of \({\mathrm{AgNO}}_{3}\) solution gives ' x' moles of \(\mathrm{AgCl}\). Consider ' x ' is equal to the number of lone pairs of electron present in central atom of \({\mathrm{BrF}}_{5}\). Then the number of geometrical isomers exhibited by the complex is ________

[JEE Main 2025, 4 Apr (Shift 2)]

The type of hybridization and the magnetic property of \({\left[{\mathrm{MnCl}}_{6}\right]}^{3-}\) are

[JEE Main 2025, 2 Apr (Shift 2)]

Consider a mixture 'X' which is made by dissolving 0.4 mol of [Co(NH₃)₅SO₄]Br and 0.4 mol of [Co(NH₃)₅Br] SO₄ in water to make 4 L of solution. When 2 L of mixture 'X' is allowed to react with excess of AgNO₃, it forms precipitate 'Y'. The rest 2 L of mixture 'X' reacts with excess BaCl₂ to form precipitate 'Z'. Which of the following statements is correct?

The correct increasing order of spin only magnetic moment values of the complex ions \(\text{ }{\left[{\mathrm{MnBr}}_{4}\right]}^{2−}\left(\mathrm{A}\right),\text{ }{\left[\mathrm{Cu}\left({\mathrm{H}}_{2}{\mathrm{O}}_{6}\right)\right]}^{2+}\text{ }\left(\mathrm{B}\right),\text{  }{\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_{4}\right]}^{2−}\text{ }\)(C) and \(\text{ }{\left[\mathrm{Ni}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\left(\mathrm{D}\right)\) is:

[JEE Main 2026, 28 Jan (Shift 2)]

The correct increasing order of spin only magnetic moment values of the complex ions \(\text{ }{\left[{\mathrm{MnBr}}_{4}\right]}^{2−}\left(\mathrm{A}\right),\text{ }{\left[\mathrm{Cu}\left({\mathrm{H}}_{2}{\mathrm{O}}_{6}\right)\right]}^{2+}\text{ }\left(\mathrm{B}\right),\text{  }{\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_{4}\right]}^{2−}\text{ }\)(C) and \(\text{ }{\left[\mathrm{Ni}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\left(\mathrm{D}\right)\) is:

[JEE Main 2026, 28 Jan (Shift 2)]

Given below are two statements:

Statement I: [CoBr₄]^2– ion will absorb light of lower energy than [CoCl₄]^2– ion.

Statement II: In [CoI₄]^2– ion, the energy separation between the two set of d-orbitals is more than [CoCl₄]^2– ion.

In the light of the above statements, choose the correct answer from the options given below:

[JEE Main 2026, 23 Jan (Shift 1)]

The correct IUPAC name of \(K _2 MnO _4\) is

[JEE Main 2024, 29 Jan (Shift 2)]

The number of complexes from the following with no electrons in the \({t}_{2}\) orbital is____________ \(TiC{l}_{4},{\left[Mn{O}_{4}\right]}^{-},{\left[Fe{O}_{4}\right]}^{2-},{\left[FeC{l}_{4}\right]}^{-},{\left[CoC{l}_{4}\right]}^{2-}\)

The number of complexes from the following with no electrons in the \({t}_{2}\) orbital is____________ \(TiC{l}_{4},{\left[Mn{O}_{4}\right]}^{-},{\left[Fe{O}_{4}\right]}^{2-},{\left[FeC{l}_{4}\right]}^{-},{\left[CoC{l}_{4}\right]}^{2-}\)

The number of complexes from the following with no electrons in the \({t}_{2}\) orbital is____________ \(TiC{l}_{4},{\left[Mn{O}_{4}\right]}^{-},{\left[Fe{O}_{4}\right]}^{2-},{\left[FeC{l}_{4}\right]}^{-},{\left[CoC{l}_{4}\right]}^{2-}\)

[JEE Main 2024, 05 Apr (Shift 2)]

The number of complexes from the following with no electrons in the \({t}_{2}\) orbital is____________ \(TiC{l}_{4},{\left[Mn{O}_{4}\right]}^{-},{\left[Fe{O}_{4}\right]}^{2-},{\left[FeC{l}_{4}\right]}^{-},{\left[CoC{l}_{4}\right]}^{2-}\)

[JEE Main 2024, 05 Apr (Shift 2)]

Identify the CORRECT set of details from the following:

A. [Co(NH₃)₆]³⁺: Inner orbital complex; d²sp³ hybridized

B. [MnCl₆]^3–:Outer orbital complex; sp³d² hybridized

C. [CoF₆]^3–: Outer orbital complex; d²sp³ hybridized

D. [FeF₆]^3–: Outer orbital complex; sp³d² hybridized

E. [Ni(CN)₄]^2–: Inner orbital complex; sp³ hybridized

Choose the correct answer from the given below:

[JEE Main 2026, 23 Jan (Shift 2)]

Among the following options, select the option in which each complex in Set-I shows geometrical isomerism and the two complexes in Set-II are ionization isomers of each other.

[en = \({H}_{2}NC{H}_{2}C{H}_{2}N{H}_{2}\)]

A reagent which gives brilliant red precipitate with Nickel ions in basic medium is

[JEE Main 2024, 29 Jan (Shift 2)]

Given below are two statements:

Statement I: [CoBr₄]^2– ion will absorb light of lower energy than [CoCl₄]^2– ion.

Statement II: In [CoI₄]^2– ion, the energy separation between the two set of d-orbitals is more than [CoCl₄]^2– ion.

In the light of the above statements, choose the correct answer from the options given below:

[JEE Main 2026, 23 Jan (Shift 1)]

Given below are two statements :
Statement (I) : In octahedral complexes, when \({\Delta }_{\mathrm{o}}<\mathrm{P}\) high spin complexes are formed. When \({\Delta }_{\mathrm{o}}>\mathrm{P}\) low spin complexes are formed.
Statement (II) : In tetrahedral complexes because of \({\Delta }_{\mathrm{t}}<\mathrm{P}\), low spin complexes are rarely formed.
In the light of the above statements, choose the most appropriate answer from the options given below :

[JEE Main 2025, 2 Apr (Shift 1)]

Which one of the following complexes will exhibit the least paramagnetic
behaviour ?
[Atomic number, \(\mathrm{Cr}=24,\mathrm{Mn}=25,\mathrm{Fe}=26,\mathrm{Co}=27\) ]

[JEE Main 2024, 5 Apr (Shift 1)]

An octahedral complex having molecular composition \(\mathrm{Co}.5{\mathrm{NH}}_{3}.\mathrm{Cl}.{\mathrm{SO}}_{4}\) has two isomers A and B . The solution of A gives a white precipitate with \({\mathrm{AgNO}}_{3}\) solution and the solution of B gives white precipitate with \({\mathrm{BaCl}}_{2}\) solution. The type of isomerism exhibited by the complex is,

[JEE Main 2025, 7 Apr (Shift 1)]

The d-orbital electronic configuration of the complex among \({\left[\mathrm{Co}(\mathrm{en}{)}_{3}\right]}^{3+},{\left[{\mathrm{CoF}}_{6}\right]}^{3-}\), \({\left[\mathrm{Mn}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\) and \({\left[\mathrm{Zn}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\) that has the highest CFSE is

[JEE Main 2025, 2 Apr (Shift 2)]

IUPAC name of \(\left[{\mathrm{PtBr}}_{2}{\left({\mathrm{PPh}}_{3}\right)}_{2}\right]\) is

Identify the coordination complexes in which the central metal ion has \({\mathrm{d}}^{4}\) configuration

\(\left(\mathrm{A}\right){\left[{\mathrm{FeO}}_{4}\right]}^{2-}\\ \left(\mathrm{B}\right){\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{C}\right){\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{D}\right){\mathrm{Cr}}_{2}{\left(\mathrm{OCOMe}\right)}_{4}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{2}\\ \left(\mathrm{E}\right){\left[{\mathrm{NiF}}_{6}\right]}^{2-}\)

[JEE Main 2025, 23 Jan (Shift 2)]

\({\mathrm{Ca}}^{2+}\)makes which type of complex with EDTA?

Which of the following has \(\mu =0\mathrm{BM}\)?

(Memory Based JEE Mains SHIFT-1 22/01/2025)

Consider the following complexes
\(\left(\mathrm{A}\right):{\left[\mathrm{CoCl}{\left({\mathrm{NH}}_{3}\right)}_{5}\right]}^{2+},\left(\mathrm{B}\right):{\left[\mathrm{Co}(\mathrm{CN}{)}_{6}\right]}^{3-},\\ \left(\mathrm{C}\right):{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+},\left(\mathrm{D}\right):{\left[\mathrm{Cu}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{4}\right]}^{2+}\)

The correct order of A, B, C and D in terms of wavenumber of light absorbed is

[JEE Main 2024, 6 Apr (Shift 1)]

Consider the following complexes
\(\left(\mathrm{A}\right):{\left[\mathrm{CoCl}{\left({\mathrm{NH}}_{3}\right)}_{5}\right]}^{2+},\left(\mathrm{B}\right):{\left[\mathrm{Co}(\mathrm{CN}{)}_{6}\right]}^{3-},\\ \left(\mathrm{C}\right):{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+},\left(\mathrm{D}\right):{\left[\mathrm{Cu}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{4}\right]}^{2+}\)

The correct order of A, B, C and D in terms of wavenumber of light absorbed is

[JEE Main 2024, 6 Apr (Shift 1)]

Consider the following complexes
\(\left(\mathrm{A}\right):{\left[\mathrm{CoCl}{\left({\mathrm{NH}}_{3}\right)}_{5}\right]}^{2+},\left(\mathrm{B}\right):{\left[\mathrm{Co}(\mathrm{CN}{)}_{6}\right]}^{3-},\\ \left(\mathrm{C}\right):{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+},\left(\mathrm{D}\right):{\left[\mathrm{Cu}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{4}\right]}^{2+}\)

The correct order of A, B, C and D in terms of wavenumber of light absorbed is

[JEE Main 2024, 06 Apr (Shift 1)]

Consider the following complexes
\(\left(\mathrm{A}\right):{\left[\mathrm{CoCl}{\left({\mathrm{NH}}_{3}\right)}_{5}\right]}^{2+},\left(\mathrm{B}\right):{\left[\mathrm{Co}(\mathrm{CN}{)}_{6}\right]}^{3-},\\ \left(\mathrm{C}\right):{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+},\left(\mathrm{D}\right):{\left[\mathrm{Cu}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{4}\right]}^{2+}\)

The correct order of A, B, C and D in terms of wavenumber of light absorbed is

[JEE Main 2024, 06 Apr (Shift 1)]

The type of isomerism present in nitropentammine chromium (III) chloride is:

The conditions and consequence that favours the \({{\mathrm{t}}_{2\mathrm{g}}}^{3}{\mathrm{e}}_{\mathrm{g}}^{1}\) configuration in a metal complex are :

[JEE Main 2025, 24 Jan (Shift 2)]

The coordination geometry around the manganese in decacarbonyldimanganese \((0)\) is

Find out the number of unpaired electrons in d-subshell for \({\left[\mathrm{Co}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+}\)

The calculated spin-only magnetic moments of \({K}_{3}\left[Fe(OH{)}_{6}\right]\) and \({K}_{4}\left[Fe(OH{)}_{6}\right]\) respectively are

[JEE Main 2025, 29 Jan (Shift 2)]

The coordination geometry around the manganese in decacarbonyldimanganese is

The d-electronic configuration of an octahedral Co (II) complex having magnetic moment of 3.95 BM is

(JEE mains memory based shift-1 23/01/2025)

Number of complexes from the following with even number of unpaired "d" electrons is

\({\left[\mathrm{V}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+},{\left[\mathrm{Cr}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+},{\left[\mathrm{Fe}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+},{\left[\mathrm{Ni}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+},{\left[\mathrm{Cu}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\)
[Given atomic numbers: \(\mathrm{V}=23,\mathrm{Cr}=24,\mathrm{Fe}=26,\mathrm{Ni}=28\mathrm{Cu}=29\)]

[JEE Main 2024, 04 Apr (Shift 1)]

Number of complexes from the following with even number of unpaired "d" electrons is

\({\left[\mathrm{V}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+},{\left[\mathrm{Cr}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+},{\left[\mathrm{Fe}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+},{\left[\mathrm{Ni}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+},{\left[\mathrm{Cu}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\)
[Given atomic numbers: \(\mathrm{V}=23,\mathrm{Cr}=24,\mathrm{Fe}=26,\mathrm{Ni}=28\mathrm{Cu}=29\)]

[JEE Main 2024, 04 Apr (Shift 1)]

Among the following options, select the option in which each complex in Set-I shows geometrical isomerism and the two complexes in Set-II are ionization isomers of each other.

[en = \({H}_{2}NC{H}_{2}C{H}_{2}N{H}_{2}\)]

\({\mathrm{Ca}}^{2+}\)makes which type of complex with EDTA?

One mole of the octahedral complex compound \(Co{\left(N{H}_{3}\right)}_{5}C{l}_{3}\) gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with excess of \(AgN{O}_{3}\) solution to yield two moles of \(AgC{l}_{(s)}\). The structure of the complex is

[JEE Main 2025, 24 Jan (Shift 1)]

\(\mathrm{Co}{({\mathrm{NH}}_{3})}_{\mathrm{x}}{\mathrm{Cl}}_{3}\) has 0.1 molal. 100% dissociation\(∆{\mathrm{T}}_{\mathrm{f}}=0.558({\mathrm{K}}_{\mathrm{f}}=1.86)\). Then formula of the compound is

(JEE mains memory based shift-1 23/01/2025)

Predict the values of magnetic moment of the given coordination compounds respectively (memory based jee mains shift-2 29/01/2025)

\({\mathrm{K}}_{3}\left[\mathrm{Fe}{\left(\mathrm{OH}\right)}_{6}\right],{\mathrm{K}}_{4}\left[\mathrm{Fe}{\left(\mathrm{OH}\right)}_{6}\right]\)

The d-electronic configuration of an octahedral Co (II) complex having magnetic moment of 3.95 BM is

(JEE mains memory based shift-1 23/01/2025)

Total number of unpaired electrons in the complex ions \(\left[ Co \left( NH _3\right)_6\right]^{3+}\) and \(\left[ NiCl _4\right]^{2-}\) is .......

[JEE Main 2024, 08 Apr (Shift 2)]

Total number of unpaired electrons in the complex ions \(\left[ Co \left( NH _3\right)_6\right]^{3+}\) and \(\left[ NiCl _4\right]^{2-}\) is .......

[JEE Main 2024, 08 Apr (Shift 2)]

' X ' is the number of electrons in \({t}_{2g}\) orbitals of the most stable complex ion among \({\left[\mathrm{Fe}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\), \({\left[\mathrm{Fe}\left({\mathrm{Cl}}_{6}\right)\right]}^{3-}\), \({\left[\mathrm{Fe}{\left({\mathrm{C}}_{2}{\mathrm{O}}_{4}\right)}_{3}\right]}^{3-}\) and \({\left[\mathrm{Fe}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+}\). The nature of oxide of vanadium of the type \({\mathrm{V}}_{2}{\mathrm{O}}_{\mathrm{x}}\) is:

[JEE Main 2025, 4 Apr (Shift 2)]

The type of isomerism present in nitropentammine chromium (III) chloride is:

The calculated spin-only magnetic moments of \({K}_{3}\left[Fe(OH{)}_{6}\right]\) and \({K}_{4}\left[Fe(OH{)}_{6}\right]\) respectively are

[JEE Main 2025, 29 Jan (Shift 2)]

The correct order of the wavelength maxima of the absorption band in the ultraviolet-visible region for the given complexes is

[JEE Advanced 2025, Paper-1]

Yellow compound of lead chromate gets dissolved on treatment with hot \(\mathrm{NaOH}\) solution. The product of lead formed is a

[JEE Main 2024, 27 Jan (Shift 1)]

Yellow compound of lead chromate gets dissolved on treatment with hot \(\mathrm{NaOH}\) solution. The product of lead formed is a

[JEE Main 2024, 27 Jan (Shift 1)]

The number of species from the following that are involved in \({\mathrm{sp}}^{3}{\mathrm{d}}^{2}\) hybridization is \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+},{\mathrm{SF}}_{6},{\left[{\mathrm{CrF}}_{6}\right]}^{3-},{\left[{\mathrm{CoF}}_{6}\right]}^{3-},{\left[\mathrm{Mn}(\mathrm{CN}{)}_{6}\right]}^{3-}\) and \({\left[{\mathrm{MnCl}}_{6}\right]}^{3-}\)

[JEE Main 2025, 8 Apr (Shift 1)]

The correct statement among the following is:

[JEE Main 2026, 28 Jan (Shift 1)]

The conditions and consequences that favour the \({\mathrm{t}}_{2}^{3}{\mathrm{e}}_{\mathrm{g}}^{1}\) configuration in a metal complex are:

(Memory Based JEE Mains 24/01/2025 ,Shift -2)

When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be

[JEE Main 2025, 24 Jan (Shift 2)]

The correct order of the complexes in terms wavelength of light absorbed is

(A) \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+}\)

(B) \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\)

(C) \({\left[\mathrm{Co}(\mathrm{CN}{)}_{6}\right]}^{3-}\)

(D) \({\left[\mathrm{CoCl}{\left({\mathrm{NH}}_{3}\right)}_{5}\right]}^{2+}\)

[JEE Main 2025, 3 Apr (Shift 1)]

IUPAC name of \(\left[{\mathrm{PtBr}}_{2}{\left({\mathrm{PPh}}_{3}\right)}_{2}\right]\) is

The correct order of ligands arranged in increasing field strength:

The correct statement among the following is:

[JEE Main 2026, 28 Jan (Shift 1)]

The number of paramagnetic metal complex species among \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+},{\left[\mathrm{Co}{\left({\mathrm{C}}_{2}{\mathrm{O}}_{4}\right)}_{3}\right]}^{3-}\), \({\left[{\mathrm{MnCl}}_{6}\right]}^{3-},{\left[\mathrm{Mn}(\mathrm{CN}{)}_{6}\right]}^{3-},{\left[{\mathrm{CoF}}_{6}\right]}^{3-},\)\({\left[\mathrm{Fe}(\mathrm{CN}{)}_{6}\right]}^{3-}\) and \({\left[{\mathrm{FeF}}_{6}\right]}^{3-}\) with same number of unpaired electrons is _______

[JEE Main 2025, 7 Apr (Shift 2)]

An octahedral complex having molecular composition \(\mathrm{Co}.5{\mathrm{NH}}_{3}.\mathrm{Cl}.{\mathrm{SO}}_{4}\) has two isomers A and B . The solution of A gives a white precipitate with \({\mathrm{AgNO}}_{3}\) solution and the solution of B gives white precipitate with \({\mathrm{BaCl}}_{2}\) solution. The type of isomerism exhibited by the complex is,

[JEE Main 2025, 7 Apr (Shift 1)]

The complex that shows Facial -Meridional isomerism is

[JEE Main 2025, 23 Jan (Shift 1)]

The correct increasing order of stability of the complexes based on \({\Delta }_{0}\) value is
I. \({\left[Mn(CN{)}_{6}\right]}^{3-}\)
II. \({\left[Co(CN{)}_{6}\right]}^{4-}\)
III. \({\left[Fe(CN{)}_{6}\right]}^{4-}\)
IV. \({\left[Fe(CN{)}_{6}\right]}^{3-}\)

One mole of the octahedral complex compound \(Co{\left(N{H}_{3}\right)}_{5}C{l}_{3}\) gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with excess of \(AgN{O}_{3}\) solution to yield two moles of \(AgC{l}_{(s)}\). The structure of the complex is

[JEE Main 2025, 24 Jan (Shift 1)]

Consider the transition metal ions \({\text{Mn}}^{3+},{\text{Cr}}^{3+},{\text{Fe}}^{3+}\) and Co³⁺ and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is

[JEE Main 2026, 22 Jan (Shift 1)]

Identify the coordination complexes in which the central metal ion has \({\mathrm{d}}^{4}\) configuration

\(\left(\mathrm{A}\right){\left[{\mathrm{FeO}}_{4}\right]}^{2-}\\ \left(\mathrm{B}\right){\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{C}\right){\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{D}\right){\mathrm{Cr}}_{2}{\left(\mathrm{OCOMe}\right)}_{4}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{2}\\ \left(\mathrm{E}\right){\left[{\mathrm{NiF}}_{6}\right]}^{2-}\)

[JEE Main 2025, 23 Jan (Shift 2)]

The number of species from the following that are involved in \({\mathrm{sp}}^{3}{\mathrm{d}}^{2}\) hybridization is

\({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+},{\mathrm{SF}}_{6},{\left[{\mathrm{CrF}}_{6}\right]}^{3-},{\left[{\mathrm{CoF}}_{6}\right]}^{3-},{\left[\mathrm{Mn}(\mathrm{CN}{)}_{6}\right]}^{3-}\) and \({\left[{\mathrm{MnCl}}_{6}\right]}^{3-}\)

[JEE Main 2025, 8 Apr (Shift 1)]

' X ' is the number of electrons in \({t}_{2g}\) orbitals of the most stable complex ion among \({\left[\mathrm{Fe}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\), \({\left[\mathrm{Fe}\left({\mathrm{Cl}}_{6}\right)\right]}^{3-}\), \({\left[\mathrm{Fe}{\left({\mathrm{C}}_{2}{\mathrm{O}}_{4}\right)}_{3}\right]}^{3-}\) and \({\left[\mathrm{Fe}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+}\). The nature of oxide of vanadium of the type \({\mathrm{V}}_{2}{\mathrm{O}}_{\mathrm{x}}\) is:

[JEE Main 2025, 4 Apr (Shift 2)]

The d-orbital electronic configuration of the complex among \({\left[\mathrm{Co}(\mathrm{en}{)}_{3}\right]}^{3+},{\left[{\mathrm{CoF}}_{6}\right]}^{3-}\), \({\left[\mathrm{Mn}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\) and \({\left[\mathrm{Zn}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\) that has the highest CFSE is

[JEE Main 2025, 2 Apr (Shift 2)]

The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively :
\({\left[\mathrm{Fe}(\mathrm{CN}{)}_{6}\right]}^{3-},{\left[{\mathrm{FeF}}_{6}\right]}^{3-},{\left[{\mathrm{CoF}}_{6}\right]}^{3-},{\left[\mathrm{Mn}(\mathrm{CN}{)}_{6}\right]}^{3-}\)

[JEE Main 2025, 7 Apr (Shift 2)]

Given below are two statements :
Statement I : A homoleptic octahedral complex, formed using monodentate ligands, will not show stereoisomerism.
Statement II : cis- and trans- platin are heteroleptic complexes of Pd .
In the light of the above statements, choose the correct answer from the options given below.

[JEE Main 2025, 8 Apr (Shift 1)]

Select the option with correct property -

[JEE Main 2024, 31 Jan (Shift 2)]

The correct order of ligands arranged in increasing field strength:

[JEE Main 2024, 5 Apr (Shift 1)]

The correct sequence of ligands in the order of decreasing field strength is :

\({\mathrm{CrCl}}_{3}.{\mathrm{xNH}}_{3}\) can exist as a complex. 0.1 molal aqueous solution of this complex shows a depression in freezing point of \(0.{558}^{0}\mathrm{C}\). Assuming ionisation of this complex and coordination number of Cr is 6 , the complex will be (Given \({\mathrm{K}}_{\mathrm{f}}=1.86\mathrm{Kkg}{\mathrm{mol}}^{-1}\) )

Match List-I with List-II:

Choose the correct answer from the options given below:

Identify the coordination complexes in which the central metal ion has \({\mathrm{d}}^{4}\) configuration

\(\left(\mathrm{A}\right){\left[{\mathrm{FeO}}_{4}\right]}^{2-}\\ \left(\mathrm{B}\right){\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{C}\right){\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{D}\right){\mathrm{Cr}}_{2}{\left(\mathrm{OCOMe}\right)}_{4}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{2}\\ \left(\mathrm{E}\right){\left[{\mathrm{NiF}}_{6}\right]}^{2-}\)

[JEE Main 2025, 23 Jan (Shift 2)]

Identify the homoleptic complexes with odd number of d electrons in the central metal :
(A) \({\left[Fe{O}_{4}\right]}^{2-}\)
(B) \({\left[Fe(CN{)}_{6}\right]}^{3-}\)
(C) \({\left[Fe(CN{)}_{5}NO\right]}^{2-}\)
(D) \({\left[CoC{l}_{4}\right]}^{2-}\)
(E) \(\left[Co{\left({H}_{2}O\right)}_{3}{F}_{3}\right]\)

Choose the correct answer from the options given below

[JEE Main 2025, 29 Jan (Shift 2)]

The sum of the spin only magnetic moment values (in B.M.) of \(\left[ Mn ( Br )_6\right]^{3-}\) and \(\left[ Mn ( CN )_6\right]^{3-}\) is________.

[JEE Advanced 2025, Paper-2]

The correct order of the wavelength maxima of the absorption band in the ultraviolet-visible region for the given complexes is

The spin only magnetic moment ( \(\mu\) ) value (B.M.) of the compound with strongest oxidising power among \(M{n}_{2}{O}_{3}\), TiO and VO is ______ B.M. (Nearest integer).

[JEE Main 2025, 28 Jan (Shift 2)]

\({\mathrm{CrCl}}_{3}.{\mathrm{xNH}}_{3}\) can exist as a complex. 0.1 molal aqueous solution of this complex shows a depression in freezing point of \(0.{558}^{0}\mathrm{C}\). Assuming ionisation of this complex and coordination number of Cr is 6 , the complex will be (Given \({\mathrm{K}}_{\mathrm{f}}=1.86\mathrm{Kkg}{\mathrm{mol}}^{-1}\) )

[JEE Main 2025, 23 Jan (Shift 1)]

A transition metal (M) among \(\mathrm{Mn},\mathrm{Cr},\mathrm{Co}\) and Fe has the highest standard electrode potential \(\left({\mathrm{M}}^{3+}/{\mathrm{M}}^{2+}\right)\). It forms a metal complex of the type \({\left[\mathrm{M}(\mathrm{CN}{)}_{6}\right]}^{4-}\). The number of electrons present in the \({e}_{g}\) orbital of the complex is________

[JEE Main 2025, 2 Apr (Shift 1)]

Which of the following complex produce 2 mole of AgCl ppt in the presence of excess amount of \(AgN{O}_{3}\) solution.(Jee mains shift-1 memory based 24/01/2025)

The 'Spin only' Magnetic moment for \(\left[ Ni \left( NH _3\right)_6\right]^{2+}\) is .............. \(\times 10^{-1} BM\).

\((\) given \(=\) Atomic number of \(Ni : 28)\)

[JEE Main 2024, 31 Jan (Shift 1)]

The correct order of the complexes in terms wavelength of light absorbed is

(A) \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+}\)

(B) \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\)

(C) \({\left[\mathrm{Co}(\mathrm{CN}{)}_{6}\right]}^{3-}\)

(D) \({\left[\mathrm{CoCl}{\left({\mathrm{NH}}_{3}\right)}_{5}\right]}^{2+}\)

[JEE Main 2025, 3 Apr (Shift 1)]

Which of the following complex produce 2 mole of AgCl ppt in the presence of excess amount of \(AgN{O}_{3}\) solution.(Jee mains shift-1 memory based 24/01/2025)

Given below are two statements:
Statement (I) : A solution of \(\left[ Ni \left( H _2 O \right)_6\right]^{2+}\) is green in colour.
Statement (II) : A solution of \(\left[ Ni ( CN )_4\right]^{2-}\) is colourless.
In the light of the above statements, choose the most appropriate answer from the options given below :

[JEE Main 2024, 1 Feb (Shift 1)]

The correct IUPAC name of \(\left[ PtBr _2\left( PMe _3\right)_2\right]\) is :

Statement I : \(PF_5\) and \(BrF_5\) both exhibit \(sp^3 d\) hybridisation.

Statement I : Both \(SF _6\) and \(\left[ Co \left( NH _3\right)_6\right]^{3+}\) exhibit \(sp ^3 d ^2\) hybridisation. In the light of the above statements, choose the correct answer from the option given below :

[JEE Main 2024, 06 Apr (Shift 2)]

Statement I : \(PF_5\) and \(BrF_5\) both exhibit \(sp^3 d\) hybridisation.

Statement I : Both \(SF _6\) and \(\left[ Co \left( NH _3\right)_6\right]^{3+}\) exhibit \(sp ^3 d ^2\) hybridisation. In the light of the above statements, choose the correct answer from the option given below :

[JEE Main 2024, 06 Apr (Shift 2)]

Consider the following complex ions
\(\mathrm{P}={\left[{\mathrm{FeF}}_{6}\right]}^{3-}\\ \mathrm{Q}={\left[\mathrm{V}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\\ \mathrm{R}={\left[\mathrm{Fe}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\)

The correct order of the complex ions, according to their spin only magnetic moment values (in B.M.) is :

[JEE Main 2024, 27 Jan (Shift 1)]

If an iron (III) complex with the formula \({\left[Fe{\left(N{H}_{3}\right)}_{x}(CN{)}_{y}\right]}^{-}\) has no electron in its \({e}_{g}\) orbital, then the value of x+y is

[JEE Main 2024, 4 Apr (Shift 2)]

Among \(\mathrm{V}{\left(\mathrm{CO}\right)}_{6},\mathrm{Cr}{\left(\mathrm{CO}\right)}_{5},\mathrm{Cu}{\left(\mathrm{CO}\right)}_{3},\mathrm{Mn}{\left(\mathrm{CO}\right)}_{5},\mathrm{Fe}{\left(\mathrm{CO}\right)}_{5},{\left[\mathrm{Co}{\left(\mathrm{CO}\right)}_{3}\right]}^{3-},{\left[\mathrm{Cr}{\left(\mathrm{CO}\right)}_{4}\right]}^{4-}\),and \(Ir(\mathrm{CO}{)}_{3}\), the total number of species isoelectronic with \(\mathrm{Ni}(\mathrm{CO}{)}_{4}\) is _______
[Given, atomic number: \(V=23,Cr=24,Mn=25,Fe=26,Co=27,Ni=28,Cu=29,Ir=77\) ]

The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively :
\({\left[\mathrm{Fe}(\mathrm{CN}{)}_{6}\right]}^{3-},{\left[{\mathrm{FeF}}_{6}\right]}^{3-},{\left[{\mathrm{CoF}}_{6}\right]}^{3-},\)\({\left[\mathrm{Mn}(\mathrm{CN}{)}_{6}\right]}^{3-}\)

[JEE Main 2025, 7 Apr (Shift 2)]

Select the option with correct property-

[JEE Main 2024, 31 Jan (Shift 2)]

Select the option with correct property-

[JEE Main 2024, 31 Jan (Shift 2)]

Identify the CORRECT set of details from the following:

A. [Co(NH₃)₆]³⁺: Inner orbital complex; d²sp³ hybridized

B. [MnCl₆]^3–:Outer orbital complex; sp³d² hybridized

C. [CoF₆]^3–: Outer orbital complex; d²sp³ hybridized

D. [FeF₆]^3–: Outer orbital complex; sp³d² hybridized

E. [Ni(CN)₄]^2–: Inner orbital complex; sp³ hybridized

Choose the correct answer from the given below:

[JEE Main 2026, 23 Jan (Shift 2)]

Identify the coordination complexes in which the central metal ion has \({\mathrm{d}}^{4}\) configuration

\(\left(\mathrm{A}\right){\left[{\mathrm{FeO}}_{4}\right]}^{2-}\\ \left(\mathrm{B}\right){\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{C}\right){\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{D}\right){\mathrm{Cr}}_{2}{\left(\mathrm{OCOMe}\right)}_{4}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{2}\\ \left(\mathrm{E}\right){\left[{\mathrm{NiF}}_{6}\right]}^{2-}\)

[JEE Main 2025, 23 Jan (Shift 2)]

Given below are two statements:
Statement I: The number of paramagnetic species among [CoF₆]^3-, [TiF₆]^3-, V₂O₅ and [Fe(CN)₆]^3- is 3.

Statement II: K₄[Fe(CN)₆] < K₃[Fe(CN)₆] < [Fe(H₂O)₆] SO₄.H₂O < [Fe(H₂O)₆]Cl₃ is the correct order in terms of number of unpaired electron(s) present in the complexes.

In the light of the above statements, choose the correct answer from the options given below

' X ' is the number of acidic oxides among \({\mathrm{VO}}_{2}\), \({\mathrm{V}}_{2}{\mathrm{O}}_{3},{\mathrm{CrO}}_{3},{\mathrm{V}}_{2}{\mathrm{O}}_{5}\) and \({\mathrm{Mn}}_{2}{\mathrm{O}}_{7}\). The primary valency of cobalt in \({\left[\mathrm{Co}{\left({\mathrm{H}}_{2}{\mathrm{NCH}}_{2}{\mathrm{CH}}_{2}{\mathrm{NH}}_{2}\right)}_{3}\right]}_{2}{\left({\mathrm{SO}}_{4}\right)}_{3}\) is Y . The value of \(\mathrm{X}+\mathrm{Y}\) is

[JEE Main 2025, 7 Apr (Shift 2)]

Identify from the following species in which \({\mathrm{d}}^{2}{\mathrm{sp}}^{3}\) hybridization is shown by central atom:

[JEE Main 2024, 27 Jan (Shift 2)]

Identify from the following species in which \(\mathrm{d}^{2} \mathrm{sp}^{3}\) hybridization is shown by central atom :

[JEE Main 2024, 27 Jan (Shift 2)]

The conditions and consequence that favours the \({{\mathrm{t}}_{2\mathrm{g}}}^{3}{\mathrm{e}}_{\mathrm{g}}^{1}\) configuration in a metal complex are :

[JEE Main 2025, 24 Jan (Shift 2)]

Identify the homoleptic complexes with odd number of d electrons in the central metal :
(A) \({\left[Fe{O}_{4}\right]}^{2-}\)
(B) \({\left[Fe(CN{)}_{6}\right]}^{3-}\)
(C) \({\left[Fe(CN{)}_{5}NO\right]}^{2-}\)
(D) \({\left[CoC{l}_{4}\right]}^{2-}\)
(E) \(\left[Co{\left({H}_{2}O\right)}_{3}{F}_{3}\right]\)

Choose the correct answer from the options given below.

[JEE Main 2025, 29 Jan (Shift 2)]

Match List I with List II

Choose the correct answer from the options given below :

[JEE Main 2024, 31 Jan (Shift 2)]

The coordination environment of \(C{a}^{2+}\) ion in its complex with \(EDT{A}^{4-}\) is :

[JEE Main 2024, 9 Apr (Shift 2)]

' X ' is the number of acidic oxides among \({\mathrm{VO}}_{2}\), \({\mathrm{V}}_{2}{\mathrm{O}}_{3},{\mathrm{CrO}}_{3},{\mathrm{V}}_{2}{\mathrm{O}}_{5}\) and \({\mathrm{Mn}}_{2}{\mathrm{O}}_{7}\). The primary valency of cobalt in \({\left[\mathrm{Co}{\left({\mathrm{H}}_{2}{\mathrm{NCH}}_{2}{\mathrm{CH}}_{2}{\mathrm{NH}}_{2}\right)}_{3}\right]}_{2}{\left({\mathrm{SO}}_{4}\right)}_{3}\) is Y . The value of \(\mathrm{X}+\mathrm{Y}\) is

[JEE Main 2025, 7 Apr (Shift 2)]

Which of the following complex is paramagnetic
Memory Based Question 28/Jan/25 Evening shift

The spin-only magnetic moment value of \({\mathrm{M}}^{\text{n+- }}\) ion formed among \(\mathrm{Ni},\mathrm{Zn},\mathrm{Mn}\) and Cu that has the least enthalpy of atomisation is _______. (in nearest integer)
Here n is equal to the number of diamagnetic complexes among \({\mathrm{K}}_{2}\left[{\mathrm{NiCl}}_{4}\right],\left[\mathrm{Zn}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]{\mathrm{Cl}}_{2}\), \({\mathrm{K}}_{3}\left[\mathrm{Mn}(\mathrm{CN}{)}_{6}\right]\) and \(\left[\mathrm{Cu}{\left({\mathrm{PPh}}_{3}\right)}_{3}\mathrm{I}\right]\)

[JEE Main 2025, 2 Apr (Shift 2)]

When ethane-1, 2-diammine is progressively added to aqueous solution of Nickel (II) chloride the sequence of colour change observed will be:

(Memory Based JEE Mains 24/01/2025 ,Shift -2)

Which of the following complex is paramagnetic
Memory Based Question 28/Jan/25 Evening shift

The crystal field splitting energy of [Co(oxalate)₃]^3– complex is 'n' times that of the [Cr(oxalate)₃]^3–complex. Here 'n' is____. (Assume \({\Delta }_{0}≫\mathrm{P}\))

The crystal field splitting energy of [Co(oxalate)₃]^3– complex is 'n' times that of the [Cr(oxalate)₃]^3–complex. Here 'n' is____. (Assume \({\Delta }_{0}≫\mathrm{P}\))

Find out the number of unpaired electrons in d-subshell for \({\left[\mathrm{Co}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+}\)

Which of the following complex has \({\mathrm{d}}^{4}\) configuration?

(Memory Based JEE Mains 23/01/2025 ,Shift -2)

Which of the following complex has \({\mathrm{d}}^{4}\) configuration?

(Memory Based JEE Mains 23/01/2025 ,Shift -2)

The complex that shows Facial -Meridional isomerism is

[JEE Main 2025, 23 Jan (Shift 1)]

\(\left[ Co \left( NH _3\right)_6\right]^{3+} \text { and }\left[ CoF _6\right]^{3-} \) are respectively known as :

[JEE Main 2024, 1 Feb (Shift 2)]

The number of species from the following that are involved in \({\mathrm{sp}}^{3}{\mathrm{d}}^{2}\) hybridization is \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+},{\mathrm{SF}}_{6},{\left[{\mathrm{CrF}}_{6}\right]}^{3-},{\left[{\mathrm{CoF}}_{6}\right]}^{3-},{\left[\mathrm{Mn}(\mathrm{CN}{)}_{6}\right]}^{3-}\) and \({\left[{\mathrm{MnCl}}_{6}\right]}^{3-}\)

[JEE Main 2025, 8 Apr (Shift 1)]

The conditions and consequences that favour the \({\mathrm{t}}_{2}^{3}{\mathrm{e}}_{\mathrm{g}}^{1}\) configuration in a metal complex are:

(Memory Based JEE Mains 24/01/2025 ,Shift -2)

\(\mathrm{Co}{({\mathrm{NH}}_{3})}_{\mathrm{x}}{\mathrm{Cl}}_{3}\) has 0.1 molal. 100% dissociation\(∆{\mathrm{T}}_{\mathrm{f}}=0.558({\mathrm{K}}_{\mathrm{f}}=1.86)\). Then formula of the compound is

(JEE mains memory based shift-1 23/01/2025)

When ethane-1, 2-diammine is progressively added to aqueous solution of Nickel (II) chloride the sequence of colour change observed will be:

(Memory Based JEE Mains 24/01/2025 ,Shift -2)

Consider the transition metal ions \({\text{Mn}}^{3+},{\text{Cr}}^{3+},{\text{Fe}}^{3+}\) and Co³⁺ and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is

[JEE Main 2026, 22 Jan (Shift 1)]

Given below are two statements:
Statement I: \(\left[ Mn ( CN )_6\right]^{3-},\left[ Fe ( CN )_6\right]^{3-}\) and \(\left[ Co \left( C _2 O _4\right)_3\right]^{3-}\) are \(d ^2 sp ^3\) hybridised
Statement II: \(\left[ MnCl _6\right]^{3-}\) and \(\left[ FeF _6\right]^{3-}\) are paramagnetic and have 4 and 5 unpaired electrons, respectively.

In the light of the above statements, choose the correct answer from the options given below: [JEE Main 2021, 27 Jul (Shift 2)]

The primary and secondary valencies of cobalt respectively in \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2\) are: [JEE Main 2023, 24 Jan (Shift 1)]

The complex cation which has two isomers is:

[JEE Main 2023, 1 Feb (Shift 2)]

The complex that can show fac- and mer- isomers is:
[JEE Main 2020, 8 Jan (Shift 1)]

The stepwise formation of \(\left[ Cu \left( NH _3\right)_4\right]^{2+}\) is given below:
\(\begin{aligned} & Cu ^{2+}+ NH _3 \stackrel{ k _1}{\rightleftharpoons}\left[ Cu \left( NH _3\right)\right]^{2+} \\ & {\left[ Cu \left( NH _3\right)\right]^{2+}+ NH _3 \stackrel{ k _2}{\rightleftharpoons}\left[ Cu \left( NH _3\right)_2\right]^{2+}} \\ & {\left[ Cu \left( NH _3\right)_2\right]^{2+}+ NH _3 \stackrel{ k _3}{\rightleftharpoons}\left[ Cu \left( NH _3\right)_3\right]^{2+}} \\ & {\left[ Cu \left( NH _3\right)_3\right]^{2+}+ NH _3 \stackrel{ k _4}{\rightleftharpoons}\left[ Cu \left( NH _3\right)_4\right]^{2+}}\end{aligned}\)

The value of stability constants \(k _1, k _2, k _3\) and \(k _4\) are \(10^4\), \(1.58 \times 10^3, 5 \times 10^2\) and \(10^2\) respectively.
The overall equilibrium constants for dissociation of \(\left[ Cu \left( NH _3\right)_4\right]^{2+}\) is \(x \times 10^{-12}\). The value of \(x\) is ---------------------(Rounded off to the nearest integer)

[JEE Main 2021, 24 Feb (Shift 1)]

Homoleptic complex from the following complexes is :

[NEET 2023]

Complex 'X' of composition of \(\mathrm{Cr}{({\mathrm{H}}_{2}\mathrm{O})}_{6}{\mathrm{Cl}}_{\mathrm{n}}\) has a spin only magnetic moment of \( 3.83 \mathrm{~BM} \). It reacts with \( \mathrm{AgNO}_{3} \) and shows geometrical isomerism. The IUPAC nomenclature of X is :

[JEE Main 2020, 9 Jan (Shift 1)]

The spin only magnetic moment value for the complex \(\left[ Co ( CN )_6\right]^{4-}\) is ___ BM. [At. No. of \(Co =27\) ](nearest integer)

[JEE Main 2021, 20 Jul (Shift 1)]

\( [\mathrm{Pd}(\mathrm{F})(\mathrm{Cl})(\mathrm{Br})(\mathrm{I})]^{2-} \)-has n number of geometrical isomers. Then, the spin-only magnetic moment and crystal field stabilisation energy [CFSE] of \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{n-6} \), respectively, are : [Note : Ignore the pairing energy]

[JEE Main 2020, 9 Jan (Shift 1)]

The isomer(s) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right] \) that has/have a \( \mathrm{Cl}-\mathrm{Co}-\mathrm{Cl} \) angle of \( 90^{\circ} \), is/are:

[JEE Main 2020, 9 Jan (Shift 2)]

Which of the following cannot be explained by crystal field theory? [JEE Main 2023, 24 Jan (Shift 2)]

The correct order of intensity of colors of the compounds is:

[JEE Main 2021, 20 Jul (Shift 1)]

Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is: [JEE Main 2021, 27 Aug (Shift 1)]

For a \(\mathrm{d}^4\) metal ion in an octahedral field, the correct electronic configuration is :

[JEE Main 2020, 6 Sep (Shift 2)]

The solubility of silver broomide in hypo solution involves the formation of:

\(1 \mathrm{~mol}\) of an octahedral metal complex with formula \(\mathrm{MCl}_3 \cdot 2 \mathrm{~L}\) on reaction with excess of \(\mathrm{AgNO}_3\) gives \(1 \mathrm{~mol}\) of \(\mathrm{AgCl}\). The denticity of Ligand \(\mathrm{L}\) is ..... (Integer answer) [JEE Main 2021, 27 Aug (Shift 1)]

For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements :
(I) both the complexes can be high spin.
(II) \(\mathrm{Ni}(\mathrm{II})\) complex can very rarely be low spin.
(III) with strong field ligands, \(\mathrm{Mn}\) (II) complexes can be low spin.
(IV) aqueous solution of \(\mathrm{Mn}\) (II) ions is yellow in color.

The correct statements are :

[JEE Main 2020, 2 Sep (Shift 1)]

The denticity of an organic ligand, biuret is?

[JEE Main 2021, 31 Aug (Shift 1)]

The d-electron configuration of \( \left[\mathrm{Ru}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2} \) and \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{2} \), respectively are

[JEE Main 2020, 3 Sep (Shift 2)]

The species that has a spin-only magnetic moment of \(5.9\mathrm{BM}\), is \(\left({\mathrm{T}}_{\mathrm{d}}=\right.\) tetrahedral \()\)

[JEE Main 2020, 6 Sep (Shift 1)]

The primary and secondary valencies of cobalt respectively in \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2\) are

[JEE Main 2023, 24 Jan (Shift 1)]

The IUPAC name of \(K _3\left[ Co \left( C _2 O _4\right)_3\right]\) is:

The overall stability constant of the complex ion \( \left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \) is \( 2.1 \times 10^{13} \). The overall dissociation constant is \( \mathrm{y} \times 10^{-14} \). Then y is

[JEE Main 2021, 26 Aug (Shift 2)]

Given below are two statements, one is labelled as Assertion (A) and the other is labelled as (Reason R).

Assertion (A): \(\left[ CoCl \left( NH _3\right)_5\right]^{2+}\) absorbs at lower wavelength of light with respect to \(\left[ Co \left( NH _3\right)_5\left( H _2 O \right)\right]^{3+}\)
Reason (R): It is because the wavelength of the light absorbed depends on the oxidation state of the metal ion.

In the light of the above statements, choose the correct answer from the options given below

Among the ligands \(N{H}_{3}\), en, \(C{N}^{-}\)and CO the correct order of their increasing field strength, is :

The IUPAC name of the complex \( \left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}\left(\mathrm{NH}_{2} \mathrm{CH}_{3}\right)\right] \mathrm{Cl} \) is :
[JEE Main 2020, 7 Jan (Shift 1)]

Which of the following are the example of double salt?
A. \(\mathrm{FeSO}_4 .\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4 .6 \mathrm{H}_2 \mathrm{O}\)
B. \(\mathrm{CuSO}_4 .4 \mathrm{NH}_3 \cdot \mathrm{H}_2 \mathrm{O}\)
C. \(\mathrm{K}_2 \mathrm{SO}_4 \cdot \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 \cdot 24 \mathrm{H}_2 \mathrm{O}\)
D. \(\mathrm{Fe}(\mathrm{CN})_2, 4 \mathrm{KCN}\)
Choose the correct answer
[JEE Main 2023, 1 Feb (Shift 1)]

The observed magnetic moment of the complex \({[\mathrm{Mn}{\left(\mathrm{NCS}\right)}_{6}]}^{-\mathrm{x}}\) is (6.06 BM). The numerical value of (x) is ____

[JEE Main 2023, 08 Apr (Shift 2)]

The IUPAC name of \(K _3\left[ Co \left( C _2 O _4\right)_3\right]\) is:

[JEE Main 2023, 6 Apr (Shift 2)]

The complex with highest magnitude of crystal field splitting energy \(\left(\Delta_0\right)\) is

[JEE Main 2023, 15 Apr (Shift 1)]

The theory that can completely/properly explain the nature of bonding in \( \left[\mathrm{Ni}(\mathrm{CO})_{4}\right] \) is :
[JEE Main 2020, 7 Jan (Shift 1)]

Indicate the complex/complex ion which did not show any geometrical isomerism:

Which one of the following complexes is violet in colour?

[JEE Main 2021, 26 Aug (Shift 1)]

One complete reaction of \(\mathrm{FeCl}_3\) with oxalic acid in aqueous solution containing \(\mathrm{KOH}\), resulted in the formation of product A. The secondary valency of \(\mathrm{Fe}\) in the product \(\mathrm{A}\) is ____ (Round off to the Nearest Integer).

[JEE Main 2021, 17 Mar (Shift 2)]

Given below are two statements

Statement I : Both \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\) and \({\left[{\mathrm{CoF}}_{6}\right]}^{3-}\) complexes are octahedral but differ in their magnetic behaviour.

Statement II : \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\) is diamagnetic whereas \({\left[{\mathrm{CoF}}_{6}\right]}^{3-}\) is paramagnetic.

In the light of the above statements, choose the correct answer from the options given below

Consider that a \(\mathrm{d}^6\) metal ion \(\left(\mathrm{M}^{2+}\right)\) forms a complex with aqua ligands, and the spin only magnetic moment of the complex is 4.90 BM. The geometry and the crystal field stabilization energy of the complex is :
[JEE Main 2020, 2 Sep (Shift 1)]

The values of the crystal field stabilization energies for a high spin \( \mathrm{d}^{6} \) metal ion in octahedral and tetrahedral fields, respectively, are

[JEE Main 2020, 5 Sep (Shift 1)]

The Crystal Field Stabilization Energy (CFSE) of \( \left[\mathrm{CoF}_{3}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}\right]\left(\Delta_{0}<\mathrm{P}\right) \) is

[JEE Main 2020, 4 Sep (Shift 2)]

Which one of the following metal complexes is most stable? [JEE Main 2021, 25 Jul (Shift 2)]

The ratio of spin-only magnetic moment values \(\mu_{ eff }\left[ Cr ( CN )_6\right]^{3-} / \mu_{ eff }\left[ Cr \left( H _2 O \right)_6\right]^{3+}\) is ____

[JEE Main 2023, 11 Apr (Shift 1)]

Given below are two statements:
Statement I: The identification of \(\ \mathrm{Ni}^{2+} \) is carried out by dimethyl glyoxime in the presence of \(\ \mathrm{NH}_4 \mathrm{OH} \)
Statement II: The dimethyl glyoxime is a bidentate neutral ligand.
In the light of the above statements, choose the correct answer from the options given below:

[JEE Main 2021, 25 Feb (Shift 2)]

The complex that dissolves in water is

[JEE Main 2023, 11 Apr (Shift 1)]

3 moles of metal complex with formula \(\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_3\) gives 3 moles of silver chloride on treatment with excess of silver nitrate. The secondary valency of Co in the complex is _______. (Round off to the nearest integer) [JEE Main 2021, 27 Jul (Shift 2)]

The total number of unpaired electrons present in the complex \( \mathrm{K}_{3}\left[\mathrm{Cr}(\text { oxalate })_{3}\right] \) is _____.

[JEE Main 2021, 18 Mar (Shift 1)]

Element not present in Nessler's reagent is:

[JEE Main 2023, 6 Apr (Shift 2)]

The complex with highest magnitude of crystal field splitting energy \(\left(\Delta_0\right)\) is

Which one of the following species doesn't have a magnetic moment of 1.73 \(\mathrm{BM}\), (spin only value)?

[JEE Main 2021, 20 Jul (Shift 2)]

If \(Ni ^{2+}\) is replaced by \(Pt ^{2+}\) in the complex \(\left[ NiCl _2 Br _2\right]^{2-}\), which of the following properties are expected to get changed?
A. Geometry
B. Geometrical isomerism
C. Optical isomerism
D. Magnetic properties

Indicate the complex/complex ion which did not show any geometrical isomerism:

[JEE Main 2021, 26 Aug (Shift 2)]

Ethylene diaminetetraacetate ion is:

[NEET 2021]

The number of possible optical isomers for the complexes \( \mathrm{MA}_{2} \mathrm{~B}_{2} \) with \( \mathrm{sp}^{3} \) and \( \mathrm{dsp}^{2} \) hybridized metal atom, respectively, is:

Note: A and B unidentate neutral and unidentate monoanionic ligands, respectively.

[JEE Main 2020, 7 Jan (Shift 2)]

The volume (in \(\mathrm{mL}\) ) of \(0.1 \mathrm{~M} \mathrm{~AgNO}_3\) required for complete precipitation of chloride ions present in \(\mathrm{20~mL}\) of \(0.01 \mathrm{~M}\) solution of \(\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{Cl}] \mathrm{Cl}_2\right.\) as silver chloride is

[JEE Main 2023, 15 Apr (Shift 1)]

The set which does not have ambidentate ligand(s) is

[JEE Main 2023, 11 Apr (Shift 1)]

The electronic spectrum of \( \left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \) shows a single broad peak with a maximum at \( 20,300 \mathrm{~cm}^{-1} \). The crystal field stabilization energy (CFSE) of the complex ion, in \( \mathrm{kJ} \mathrm{mol}^{-1}, (1 \mathrm{~kJ} \mathrm{~mol}^{-1}=83.7 \mathrm{~cm}^{-1})\)

[JEE Main 2020, 3 Sep (Shift 1)]

Which one of the following species doesn't have a magnetic moment of 1.73BM, (spin only value)?

Consider the complex ions,trans- \( \left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}(\mathrm{A}) \) and cis- \( \left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}(\mathrm{B}) \). The correct statement regarding them is
[JEE Main 2020, 5 Sep (Shift 2)]

The calculated spin only magnetic moments of\( \left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \) and \( \left[\mathrm{CuF}_{6}\right]^{3-} \) in BM, respectively, are (Atomic numbers of \( \mathrm{Cr} \) and \( \mathrm{Cu} \) are 24 and 29 ,respectively)

[JEE Advanced 2021, Paper-1]

The spin only magnetic moment of \(\left[ Mn \left( H _2 O \right)_6\right]^{2+}\) complexes is _____B.M. (Nearest integer) (Given : Atomic no. of Mn is 25)

[JEE Main 2023, 1 Feb (Shift 2)]

The secondary valency and the number of hydrogen bonded water molecule(s) in \( \mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O} \), respectively:

[JEE Main 2021, 18 Mar (Shift 2)]

The number of optical isomers possible for \({\left[\mathrm{Cr}{\left({\mathrm{C}}_{2}{\mathrm{O}}_{4}\right)}_{3}\right]}^{3-}is......\)

[JEE Main 2021, 27 Aug (Shift 2)]

The correct pair(s) of the ambident nucleophiles is (are):

(i) \(\mathrm{AgCN} / \mathrm{KCN}\)
(ii) \(\mathrm{RCOOAg} / \mathrm{RCOOK}\)
(iii) \(\mathrm{AgNO}_2 / \mathrm{KNO}_2\)
(iv) \(\mathrm{AgI} / \mathrm{KI}\)

[JEE Main 2021, 17 Mar (Shift 2)]

The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion \(\left( M ^{ Z+ }\right)\) are \(-0.8 ~\Delta_0\) and \(3.87 ~BM\), respectively. Identify \(\left( M ^{ Z +}\right)\) :

[JEE Main 2021, 1 Sep (Shift 2)]

Which complex compound is most stable?

Which one of the following complexes is not expected to exhibit isomerism?

[JEE Main 2020, 2 Sep (Shift 2)]

\( \left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \) absorbs light of wavelength \( 498 \mathrm{~nm} \) during a d-d transition. The octahedral splitting energy for the above complex is ____\( \times 10^{-19} \mathrm{~J} \). (Round off to the Nearest Integer). \( h=6.626 \times 10^{-34} \mathrm{Js} ; \mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1} \)

[JEE Main 2021, 16 Mar (Shift 2)]

The complex that can show optical activity

The number of isomers possible for \( \left[\mathrm{Pt}(\mathrm{en})\left(\mathrm{NO}_{2}\right)_{2}\right] \) is

[JEE Main 2020, 4 Sep (Shift 1)]

The one that can exhibit highest paramagnetic behaviour among the following is:

gly \( = \) glycinato; bpy \( =2,2' \) -bipyridine

[JEE Main 2020, 4 Sep (Shift 2)]

The secondary valency and the number of hydrogen bonded water molecule(s) in \( \mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O} \), respectively:

The hybridization and magnetic behaviour of cobalt ion in \(\left[ Co \left( NH _3\right)_6\right]^{3+}\) complex, respectively is

For a metal ion, the calculated magnetic moment is 4.90 B.M. This metal ion has ____ number of unpaired electrons.

[JEE Main 2023, 10 Apr (Shift 2)]

Among the following, which will show geometrical isomerism?

\(\left(\mathrm{A}\right){\left[\mathrm{Ni}{\left({\mathrm{NH}}_{3}\right)}_{5}\mathrm{Cl}\right]}^{+}\\ \left(\mathrm{B}\right)\left[\mathrm{Ni}{\left({\mathrm{NH}}_{3}\right)}_{4}\mathrm{ClBr}\right]\\ \left(\mathrm{C}\right){\left[\mathrm{Ni}{\left({\mathrm{NH}}_{3}\right)}_{3}\mathrm{Cl}\right]}^{+}\\ \left(\mathrm{D}\right)\left[\mathrm{Ni}{\left({\mathrm{NH}}_{3}\right)}_{2}{\left({\mathrm{NO}}_{2}\right)}_{2}\right]\)

[JEE Main 2020, 8 Jan (Shift 2)]

Match List I with List II

Choose the correct answer from the options given below

[JEE Main 2023, 11 Apr (Shift 2)]

Total number of moles of \(\mathrm{AgCl}\) precipitated on addition of excess of \(\mathrm{AgNO}_3\) to one mole each of the following complexes \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_ 2\right] \mathrm{Cl},\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_2,\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]\) and \(\left[\mathrm{Pd}\left(\mathrm{NH}_3\right)_4\right] \mathrm{Cl}_2\) is.......... [JEE Main 2023, 25 Jan (Shift 2)]

The molecule in which hybrid MOs involve only one \( \mathrm{d} \)-orbital of the central atom is

The sum of oxidation states of two silver ions in \(\left[ Ag \left( NH _3\right)_2\right]\left[ Ag ( CN )_2\right]\) complex is ____.

[JEE Main 2021, 1 Sep (Shift 2)]

Complex \( \left(\mathrm{ML}_{5}\right) \) of metal \( \mathrm{Ni} \) and \( \mathrm{Fe} \) have ideal square pyramidal and trigonal bipyramidal geometries,respectively. The sum of the \( 90^{\circ}, 120^{\circ} \) and \( 180^{\circ} \mathrm{L}-\mathrm{M} \) angles in the two complexes is _______.

[JEE Main 2020, 8 Jan (Shift 2)]

The number of geometrical isomers possible in triamminetrinitrocobalt (III) is \(X\) and in trioxalatochromate (III) is \(Y\). Then the value of \(X + Y\) is ____.

[JEE Main 2021, 27 Jul (Shift 1)]

The correct order of the spin-only magnetic moments of the following complexes is :
(I) \(\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Br}_2\)
(II) \(\mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]\)
(III) \(\mathrm{Na}_3\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right](\Delta o>\mathrm{P})\)
(IV) \(\left(\mathrm{Et}_4 \mathrm{N}\right)_2\left[\mathrm{CoCl}_4\right]\)

[JEE Main 2020, 9 Jan (Shift 2)]

The ratio of number of water molecules in Mohr's salt and potash alum is --------- \(10^{-1}\) (Integer answer)

[JEE Main 2021, 26 Aug (Shift 1)]

The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is :

(A) \( \mathrm{Ni}(\mathrm{CO})_{4} \)

(B) \( \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{2} \)

(C) \( \mathrm{Na}_{2}\left[\mathrm{Ni}(\mathrm{CN})_{4}\right] \)

(D) \( \mathrm{PdCl}_{2}\left(\mathrm{PPh}_{3}\right)_{2} \)
[JEE Main 2020, 8 Jan (Shift 2)]

An aqueous solution of \( \mathrm{NiCl}_{2} \) was heated with excess sodium cyanide in presence of strong oxidizing agent to from \( \left[\mathrm{Ni}(\mathrm{CN})_{6}\right]^{2-} \). The total change in number of unpaired electrons on metal centre is ___

[JEE Main 2021, 20 Jul (Shift 2)]

The pair in which both the species have the same magnetic moment (spin only) is : [JEE Main 2020, 4 Sep (Shift 1)]

Among the statements(a)-(d), the incorrect ones are :

(a) Octahedral \( \mathrm{Co} \) (III) complexes with strong field ligands have very high magnetic moments

(b) When \( \Delta_{0}< \) P, the d-electron configuration of \( \mathrm{Co} \) (III) in an
octahedral complex is \( \mathrm{t}_{2 \mathrm{g}}^{4} \mathrm{e}_{g}^{2} \)

(c) Wavelength of light absorbed by \( \left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+} \) is lower than that of \( \left[\mathrm{CoF}_{6}\right]^{3-} \)

(d) If the \( \Delta_{0} \) for an octahedral complex of \( \mathrm{Co} \) (III) is 18,000 \( \mathrm{cm}^{-1} \) \( \Delta_{t} \) for its tetrahedral complex with the same ligand will be \( 16,000 \mathrm{~cm}^{-1} \)
[JEE Main 2020, 7 Jan (Shift 2)]

To inhibit the growth of tumours, identify the compounds used from the following:
(A) EDTA
(B) Coordination Compounds of \(Pt\)
(C) D - Penicillamine
(D) Cis - Platin

Choose the correct answer from the option given below:

[JEE Main 2023, 30 Jan (Shift 1)]