Coordination Compounds

Q1 FREE PREVIEW

PYQ

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

a

3

b

4

c

0

d

2

✓ Correct answer: c)

0

Explanation

The first three electrons fill the

\({t}_{2g}\) 𝑡2𝑔

Sv6Kpe[] orbitals singly.Sv6Kpe[]Sv6Kpe[]

The next three electrons pair up with the electrons already in the

\({t}_{2g}\) 𝑡2𝑔

Sv6Kpe[] orbitals.
This results in all six electrons occupying the

\({t}_{2g}\) 𝑡2𝑔

Sv6Kpe[] orbitals, and the

\({e}_{g}\) 𝑒𝑔

Sv6Kpe[] orbitals remain empty.Sv6Kpe[]

Q2 FREE PREVIEW

PYQ

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

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

a

\({\mathrm{K}}_{4}\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]\)

b

\({\mathrm{K}}_{3}\left[\mathrm{Fe}{\left(\mathrm{SCN}\right)}_{6}\right]\)

c

\({\mathrm{K}}_{3}\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]\)

d

\({K}_{2}\left[\mathrm{Fe}{\left({\mathrm{NH}}_{3}\right)}_{5}Br\right]\)

✓ Correct answer: a)

\({\mathrm{K}}_{4}\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]\)

Explanation

\({\mathrm{CN}}^{-}\) is the strongest ligand among all, hence pairing occurs in this case and for the complex \({\mathrm{K}}_{4}\left[\mathrm{Fe}{(\mathrm{CN})}_{6}\right],\mu =0\mathrm{BM}\)

Q3 FREE PREVIEW

PYQ

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)]

a

(A), (C) and (E) only

b

(C) and (E) only

c

(A), (B) and (D) only

d

(B) and (D) only

✓ Correct answer: d)

(B) and (D) only

Explanation

The complexes \({\left[Fe(CN{)}_{6}\right]}^{3-}\) and \({\left[CoC{l}_{4}\right]}^{2-}\) have odd-numbered d-electrons .

Q4 FREE PREVIEW

PYQ

\(\mathrm{Co}{({\mathrm{NH}}_{3})}_{\mathrm{x}}{\mathrm{Cl}}_{3}\) 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)

a

\(\left[\mathrm{Co}{({\mathrm{NH}}_{3})}_{4}{\mathrm{Cl}}_{2}\right]\)

b

\(\left[\mathrm{Co}{({\mathrm{NH}}_{3})}_{2}{\mathrm{Cl}}_{4}\right]\)

c

\(\left[\mathrm{Co}{({\mathrm{NH}}_{3})}_{5}\mathrm{Cl}\right]C{l}_{2}\)

d

\(\left[\mathrm{Co}{({\mathrm{NH}}_{3})}_{4}{\mathrm{Cl}}_{2}\right]C{l}_{2}\)

✓ Correct answer: c)

\(\left[\mathrm{Co}{({\mathrm{NH}}_{3})}_{5}\mathrm{Cl}\right]C{l}_{2}\)

Explanation

ΔTf = Kf ⋅ m ⋅ i and i = n ( 100% dissociation)

Where:

•ΔTf = Freezing point depression

•Kf = Freezing point depression constant

•m = Molality of the solution

•i = Van’t Hoff factor

Q5

PYQ

Identify the diamagnetic octahedral complex ions from below.

A. \({\left[\mathrm{Mn}(\mathrm{CN}{)}_{6}\right]}^{3-}\)
B. \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\)
C. \({\left[\mathrm{Fe}(\mathrm{CN}{)}_{6}\right]}^{4-}\)
D. \(\left[\mathrm{Co}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{3}{\mathrm{F}}_{3}\right]\)

Choose the correct answer from the options given below:

a

B and D Only

b

A and D Only

c

A and C Only

d

B and C Only

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q6

PYQ

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. \({\left[Fe(CN{)}_{6}\right]}^{3-}\)

a

II < III < I < IV

b

III < II < IV < I

c

I < II < IV < III

d

IV < III < II < I

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q7

PYQ

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

[JEE Advanced 2024, Paper-1]

a

Set-I: \(\left[Ni(CO{)}_{4}\right]\) and \(\left[PdC{l}_{2}{\left(PP{h}_{3}\right)}_{2}\right]\)
Set-II: \(\left[Co{\left(N{H}_{3}\right)}_{5}Cl\right]S{O}_{4}\) and \(\left[Co{\left(N{H}_{3}\right)}_{5}\left(S{O}_{4}\right)\right]Cl\)

b

Set-I: \(\left[Co(en){\left(N{H}_{3}\right)}_{2}C{l}_{2}\right]\) and \(\left[PdC{l}_{2}{\left(PP{h}_{3}\right)}_{2}\right]\)
Set-II: \(\left[Co{\left(N{H}_{3}\right)}_{6}\right]\left[Cr(CN{)}_{6}\right]\) and \(\left[Cr{\left(N{H}_{3}\right)}_{6}\right]\left[Co(CN{)}_{6}\right]\)

c

Set-I: \(\left[Co{\left(N{H}_{3}\right)}_{3}{\left(N{O}_{2}\right)}_{3}\right]\) and \(\left[Co(\text{ en }{)}_{2}C{l}_{2}\right]\)
Set-II: \(\left[Co{\left(N{H}_{3}\right)}_{5}Cl\right]S{O}_{4}\) and \(\left[Co{\left(N{H}_{3}\right)}_{5}\left(S{O}_{4}\right)\right]Cl\)

d

Set-I: \(\left[Cr{\left(N{H}_{3}\right)}_{5}Cl\right]C{l}_{2}\) and \(\left[Co(en){\left(N{H}_{3}\right)}_{2}C{l}_{2}\right]\)
Set-II: \(\left[Cr{\left({H}_{2}O\right)}_{6}\right]C{l}_{3}\) and \(\left[Cr{\left({H}_{2}O\right)}_{5}Cl\right]C{l}_{2}.{H}_{2}O\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q8

PYQ

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)]

a

weak field ligand, high spin complex

b

strong field ligand, low spin complex

c

weak field ligand, low spin complex

d

strong field ligand, high spin complex

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q9

PYQ

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)]

a

Green → Pale Blue → Blue → Violet

b

Violet → Blue → Pale Blue → Green

c

Pale Blue → Blue → Violet → Green

d

Pale Blue → Blue → Green → Violet

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q10

PYQ

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)

a

\(\mathrm{Pale}\mathrm{Blue}\to \mathrm{Blue}\to \mathrm{Green}\to \mathrm{Violet}\)

b

\(\mathrm{Violet}\to \mathrm{Blue}\to \mathrm{Pale}\mathrm{Blue}\to \mathrm{Green}\)

c

\(\mathrm{Pale}\mathrm{Blue}\to \mathrm{Blue}\to \mathrm{Violet}\to \mathrm{Green}\)

d

\(\mathrm{Green}\to \mathrm{Pale}\mathrm{Blue}\to \mathrm{Blue}\to \mathrm{Violet}\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q11

PYQ

Match List-I with List-II:

List-I	List-II
(A)	\({\left[{\mathrm{CoF}}_{6}\right]}^{3-}\)	(I)	\({\mathrm{sp}}^{3}{\mathrm{d}}^{2}\)
(B)	\({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\)	(II)	\({\mathrm{d}}^{2}{\mathrm{sp}}^{3}\)
(C)	\({\left[{\mathrm{NiCl}}_{4}\right]}^{2-}\)	(III)	\({\mathrm{sp}}^{3}\)
(D)	\({\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_{4}\right]}^{2-}\)	(IV)	\({\mathrm{dsp}}^{2}\)

Choose the correct answer from the options given below:

a

A-I, B-II, C-III, D-IV

b

A-II, B-I, C-IV, D-III

c

A-I, B-II, C-IV, D-III

d

A-II, B-I, C-III, D-IV

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q12

PYQ

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

a

Optical

b

Linkage

c

Ionization

d

Polymerization

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q13

PYQ

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)

a

\({{\mathrm{t}}_{2\mathrm{g}}}^{5}{{\mathrm{e}}_{\mathrm{g}}}^{2}\)

b

\({{\mathrm{e}}_{\mathrm{g}}}^{4}{{\mathrm{t}}_{2\mathrm{g}}}^{3}\)

c

\({{\mathrm{t}}_{2\mathrm{g}}}^{3}{{\mathrm{e}}_{\mathrm{g}}}^{0}\)

d

\({{\mathrm{t}}_{2\mathrm{g}}}^{6}{{\mathrm{e}}_{\mathrm{g}}}^{1}\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q14

PYQ

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

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

a

5.91 BM, 4.90 BM

b

4.90 BM, 5.91 BM

c

4.90 BM, 3.87 BM

d

3.87 BM, 4.90 BM

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q15

PYQ

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)]

a

\(\left[Co{\left(N{H}_{3}\right)}_{3}C{l}_{3}\right]\cdot 2N{H}_{3}\)

b

\(\left[Co{\left(N{H}_{3}\right)}_{4}Cl\right]\cdot C{l}_{2}\cdot N{H}_{3}\)

c

\(\left[Co{\left(N{H}_{3}\right)}_{4}C{l}_{2}\right]\cdot Cl\cdot N{H}_{3}\)

d

\(\left[Co{\left(N{H}_{3}\right)}_{5}Cl\right]C{l}_{2}\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q16

PYQ

The complex that shows Facial -Meridional isomerism is

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

a

\({\left[\mathrm{Co}{(\mathrm{en})}_{3}\right]}^{3+}\)

b

\(\left[\mathrm{Co}{({\mathrm{NH}}_{3})}_{3}{\mathrm{Cl}}_{3}\right]\)

c

\({\left[\mathrm{Co}{(\mathrm{en})}_{2}{\mathrm{Cl}}_{2}\right]}^{+}\)

d

\({\left[\mathrm{Co}{({\mathrm{NH}}_{3})}_{4}{\mathrm{Cl}}_{2}\right]}^{+}\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q17

PYQ

Which of the following is not an ambidentate ligand?

a

\({C}_{2}{O}_{4}^{2-}\)

b

\(SC{N}^{-}\)

c

\(N{O}_{2}^{-}\)

d

\(C{N}^{-}\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q18

PYQ

Which of the following are paramagnetic?
A. \({\left[\overset{}{{\mathrm{NiCl}}_{4}}\right]}^{2-}\)
B. \(\overset{}{\mathrm{Ni}}(\mathrm{CO}{)}_{4}\)

C.\({\left[\mathrm{Ni}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\)
D. \([{\left.\mathrm{Ni}(\mathrm{CN}{)}_{4}\right]}^{2-}\)
E.\(\mathrm{Ni}{\left({\mathrm{PPh}}_{3}\right)}_{4}\)

Choose the correct answer from the options given below

a

A and D only

b

A, D and E only

c

A and C only

d

B and E only

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q19

PYQ

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

a

Trigonal bipyramidal

b

Square planar

c

Tetrahedral

d

Octahedral

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q20

PYQ

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

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

a

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

b

\({\left[{\mathrm{MnF}}_{6}\right]}^{3-}\)

c

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

d

\({\left[{\mathrm{CoCl}}_{4}\right]}^{2-}\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q21

PYQ

Predict the values of magnetic moment of the given coordination compounds respectively

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

a

5.91 BM, 4.90 BM

b

4.90 BM, 5.91 BM

c

4.90 BM, 3.87 BM

d

3.87 BM, 4.90 BM

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q22

PYQ

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)]

a

B, C, D

b

A, B, E

c

C, E

d

B, D

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q23

PYQ

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

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

a

\({\mathrm{K}}_{4}\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]\)

b

\({\mathrm{K}}_{3}\left[\mathrm{Fe}{\left(\mathrm{SCN}\right)}_{6}\right]\)

c

\({\mathrm{K}}_{3}\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]\)

d

\({K}_{2}\left[\mathrm{Fe}{\left({\mathrm{NH}}_{3}\right)}_{5}Br\right]\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q24

PYQ

Among the following complexes \( (K-P) \)

\({\mathrm{K}}_{3}\left[\mathrm{Fe}(\mathrm{CN}{)}_{6}\right](K),\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]{\mathrm{Cl}}_{3}(L)\text{, }\)

\({\mathrm{Na}}_{3}[\mathrm{Co}{(\mathrm{ox})}_{3}(M),[\mathrm{Ni}{({\mathrm{H}}_{2}\mathrm{O})}_{6}]{\mathrm{Cl}}_{2}(N),\)

\({\mathrm{K}}_{2}[\mathrm{Pt}{(\mathrm{CN})}_{4}](O),[\mathrm{Zn}{({\mathrm{H}}_{2}\mathrm{O})}_{6}]{({\mathrm{NO}}_{3})}_{2}(P)\)

the diamagnetic complexes are:

a

\( K, L, M, N \)

b

\( K, M, O, P \)

c

\( L, M, O, P \)

d

\( L, M, N, O \)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q25

PYQ

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

a

\({\left[{\mathrm{NiCl}}_{4}\right]}^{2-}\)

b

\(\left[\mathrm{Ni}{\left(\mathrm{CO}\right)}_{4}\right]\)

c

\({\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_{4}\right]}^{2-}\)

d

\(\left[\mathrm{Fe}{\left(\mathrm{CO}\right)}_{5}\right]\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q26

PYQ

\({\mathrm{CrCl}}_{3}.{\mathrm{xNH}}_{3}\) 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

\(\left[\mathrm{Cr}{({\mathrm{NH}}_{3})}_{5}\mathrm{Cl}\right]C{l}_{2}\)

b

\(\left[\mathrm{Cr}{({\mathrm{NH}}_{3})}_{6}\right]C{l}_{3}\)

c

\(\left[\mathrm{Cr}{({\mathrm{NH}}_{3})}_{3}{\mathrm{Cl}}_{3}\right]\)

d

\(\left[\mathrm{Cr}{({\mathrm{NH}}_{3})}_{4}{\mathrm{Cl}}_{2}\right]Cl\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q27

PYQ

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]

a

\({\left[\mathrm{Co}{\left(CN\right)}_{6}\right]}^{3-}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}(\mathrm{Cl})\right]}^{2+}\)

b

\({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}(\mathrm{Cl})\right]}^{2+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}<{\left[\mathrm{Co}(\mathrm{CN}{)}_{6}\right]}^{3-}\)

c

\({\left[\mathrm{Co}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}(\mathrm{Cl})\right]}^{2+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\)

d

\({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}<{\left[\mathrm{Co}(\mathrm{CN}{)}_{6}\right]}^{3-}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}(\mathrm{Cl})\right]}^{2+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+}\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q28

PYQ

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

a

Spin paired Complex, Spin free Complex

b

Spin free Complex, Spin paired Complex

c

Inner orbital Complex, Spin paired Complex

d

Outer orbital Complex, Inner orbital Complex

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q29

PYQ

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

a

Dibromidobis(triphenylphosphine)platinum (II)

b

Dibromido(triphenylphosphine)platinum (IV)

c

Dibromido(triphenylphosphine)platinate (IV)

d

(triphenylphosphine)Dibromidoplatinate (IV)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q30

PYQ

The correct order of ligands arranged in increasing field strength:

a

\({\mathrm{H}}_{2}\mathrm{O}<{\mathrm{OH}}^{-}<{\mathrm{CN}}^{-}<{\mathrm{NH}}_{3}\)

b

\({\mathrm{Cl}}^{-}<{\mathrm{OH}}^{-}<{\mathrm{Br}}^{-}<{\mathrm{CN}}^{-}\)

c

\(B{r}^{-}<{F}^{-}<{H}_{2}O

d

\({F}^{-}

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q31

PYQ

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)

a

\({\mathrm{CoCl}}_{3}.4{\mathrm{NH}}_{3}\)

b

\({\mathrm{CoCl}}_{3}.5{\mathrm{NH}}_{3}\)

c

\({\mathrm{CoCl}}_{3}.3{\mathrm{NH}}_{3}\)

d

\({\mathrm{CoCl}}_{3}.6{\mathrm{NH}}_{3}\)

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q32

PYQ

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)

a

Strong field ligand; High spin complex

b

Weak field ligand; High spin complex

c

Strong field ligand; Low spin complex

d

Weak field ligand; Low spin complex

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q33

PYQ

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

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

a

trigonal prismatic

b

square planar

c

tetrahedral

d

octahedral

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q34

PYQ

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)]

a

5.92 and 4.90 B.M.

b

4.90 and 4.90 B.M.

c

4.90 and 5.92 B.M.

d

3.87 and 4.90 B.M.

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Q35

PYQ

Cobalt chloride when dissolved in water forms pink colored complex X which has octahedral geometry. This solution on treating with conc. \(HCl\) forms deep blue complex, Y which has a Z geometry. X, Y and Z, respectively, are

a

\(X =\left[ Co \left( H _2 O \right)_6\right]^{2+}, Y =\left[ CoCl _4\right]^{2-}, Z =\) Tetrahedral

b

\(X =\left[ Co \left( H _2 O \right)_6\right]^{2+}, Y =\left[ CoCl _6\right]^{3-}, Z =\) Octahedral

c

\(X =\left[ Co \left( H _2 O \right)_6\right]^{3+}, Y =\left[ CoCl _6\right]^{3-}, Z =\) Octahedral

d

\(X =\left[ Co \left( H _2 O \right)_4 Cl _2\right]^{+}, Y =\left[ CoCl _4\right]^{2-}, Z =\) Tetrahedral

🔒

Answer & explanation — PYQ Pass

Options are free to see. Unlock the correct answer and full explanation with Pass.

Unlock · ₹149

Practice more Board Chemistry PYQs