NEETChemistry

Coordination Compounds

19 NEET Chemistry previous year questions on Coordination Compounds — options free on every question; 2 include the answer & explanation free, the rest unlock with PYQ Pass.

Q1 FREE PREVIEW
PYQ
The coordination geometry around the manganese in decacarbonyldimanganese is [JEE Main 2024, 30 Jan (Shift 2)]
aTrigonal bipyramidal
bSquare pyramidal
cOctahedral
dSquare planar
✓ Correct answer: c) Octahedral
ExplanationCorrect answer: C — Octahedral Explanation: The compound decacarbonyldimanganese is Each Mn atom is bonded to: 5 CO ligands 1 Mn–Mn bond So, around each Mn: 5 (CO)+1 (Mn–Mn bond)=6 coordination sites A coordination number of 6 corresponds to octahedral geometry.Therefore, the geometry around each manganese atom is octahedral.
Q2 FREE PREVIEW
PYQ

Ethylene diaminetetraacetate ion is a/an

[Re-NEET 2024]

a

hexadentate ligand

b

ambidentate ligand

c

monodentate ligand

d

bidentate ligand

✓ Correct answer: a)

hexadentate ligand

Explanation

Ethylene diaminetetraacetate ion is a hexadentate ligand.

Q3
PYQ

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

[NEET 2024]

a

Statement I is false but Statement II is true.

b

Both Statement I and Statement II are true.

c

Both Statement I and Statement II are false.

d

Statement I is true but Statement II is false.

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Q4
PYQ

Given below are two statements:

Statements I : \({\left[Co{\left(N{H}_{3}\right)}_{6}\right]}^{3+}\) is a homoleptic complex whereas \({\left[Co{\left(N{H}_{3}\right)}_{4}C{l}_{2}\right]}^{+}\)is a heteroleptic complex.
Statements II : Complex \({\left[Co{\left(N{H}_{3}\right)}_{6}\right]}^{3+}\) has only one kind of ligands but \({\left[Co{\left(N{H}_{3}\right)}_{4}C{l}_{2}\right]}^{+}\) has more than one kind of ligands. In the light of the above statements, choose the correct answer from the options given below:

a

Statements I is false but Statements II is true.

b

Both Statements I and Statements II are true.

c

Both Statements I and Statements II are false.

d

Statements I is true but Statements II is false.

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Q5
PYQ

The correct order of the wavelength of light absorbed by the following complexes is,
A. \({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\)
B. \({\left[\mathrm{Co}(\mathrm{CN}{)}_{6}\right]}^{3-}\)
C. \({\left[\mathrm{Cu}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{4}\right]}^{2+}\)
D.\({\left[\mathrm{Ti}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+}\)

Choose the correct answer from the options given below

[NEET 2025]

a

C \(<\) D \(<\) A \(<\) B.

b

C \(<\) A \(<\) D \(<\) B

c

B \(<\) D \(<\) A \(<\) C

d

B \(<\) A \(<\) D \(<\) C

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Q6
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

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Q7
PYQ

Which of the following is not an ambidentate ligand?

[Re-NEET 2024]

a

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

b

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

c

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

d

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

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Q8
PYQ

Which of the following is not an ambidentate ligand?

a

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

b

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

c

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

d

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

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Q9
PYQ

A 1 : 3 electrolyte in an aqueous solution is

[Re-NEET 2026]

a

\([{\mathrm{CoCl}}_{2}{({\mathrm{NH}}_{3})}_{4}]\mathrm{Cl}\)

b

\([\mathrm{CoCl}{({\mathrm{NH}}_{3})}_{5}]{\mathrm{Cl}}_{2}\)

c

\([\mathrm{Co}{({\mathrm{NH}}_{3})}_{6}]{\mathrm{Cl}}_{3}\)

d

\([\mathrm{Co}{({\mathrm{NH}}_{3})}_{3}{({\mathrm{NO}}_{2})}_{3}]\)

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Q10
PYQ

Match List I with List II.

List I (Complex) List II (Oxidation Number of Metal)
A.\(\left[Ni{\left(CO\right)}_{4}\right]\) I.+1
B.\({\left[Fe{\left({H}_{2}O\right)}_{5}NO\right]}^{+2}\) II.Zero
C.\({\left[Co{\left(CO\right)}_{5}\right]}^{2-}\) III.-1
D.\({\left[Cr{\left(CO\right)}_{10}\right]}^{2-}\) IV.-2
a

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

b

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

c

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

d

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

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Q11
PYQ

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?

[NEET 2020]

a

F \(^{-}<\mathrm{SCN}^{-}<\mathrm{C}_2 \mathrm{O}_4^{2-}<\mathrm{CN}^{-}\)

b

\(\mathrm{CN}^{-}<\mathrm{C}_2 \mathrm{O}_4^{2-}<\mathrm{SCN}^{-}<\mathrm{F}^{-}\)

c

\(\mathrm{SCN}^{-}<\mathrm{F}^{-}<\mathrm{C}_2 \mathrm{O}_4^{2-}<\mathrm{CN}^{-}\)

d

\(\mathrm{SCN}^{-}<\mathrm{F}^{-}<\mathrm{CN}^{-}<\mathrm{C}_2 \mathrm{O}_4^{2-}\)

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Q12
PYQ

Which one of the following coordination compounds is used to inhibit
the growth of tumours?

a

Trans-platin

b

EDTA complex of calcium

c

\([{({\mathrm{Ph}}_{3}\mathrm{P})}_{3}\mathrm{RhCl}]\)

d

Cis - platin

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Q13
PYQ

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:

a

Statement I is correct but Statement II is false

b

Both Statement I and Statement II are false

c

Statement I is incorrect but Statement II is true

d

Both Statement I and Statement II are true

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Q14
PYQ

Which complex compound is most stable?

[NEET-2023]

a

\(\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{3}{\left({\mathrm{NO}}_{3}\right)}_{3}\right]\)

b

\(\left[{\mathrm{CoCl}}_{2}(\mathrm{en}{)}_{2}\right]{\mathrm{NO}}_{3}\)

c

\({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}_{2}{\left({\mathrm{SO}}_{4}\right)}_{3}\)

d

\(\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{4}\left({\mathrm{H}}_{2}\mathrm{O}\right)\mathrm{Br}\right]{\left({\mathrm{NO}}_{3}\right)}_{2}\)

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Q15
PYQ

Which of the following complex will show largest splitting of d-orbitals? [JEE Main 2023, 1 Feb (Shift 1)]

a

\(\left[ Fe \left( C _2 O _4\right)_3\right]^{3-}\)

b

\(\left[ FeF _6\right]^{3-}\)

c

\(\left[ Fe ( CN )_6\right]^{3-}\)

d

\(\left[ Fe \left( NH _3\right)_6\right]^{3+}\)

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Q16
PYQ

The type of hybridisation and magnetic property of the complex \(\left[ MnCl _6\right]^{3-}\), respectively, are:

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

a

\(sp ^3 d ^2\) and paramagnetic

b

\(d ^2 sp ^3\) and paramagnetic

c

\(d ^2 sp ^3\) and diamagnetic

d

\(sp ^3 d ^2\) and diamagnetic

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Q17
PYQ

In which of the following order the given complex ions are arranged correctly with respect to their decreasing spin only magnetic moment?
(i) \(\left[ FeF _6\right]^{3-}\),
(ii) \(\left[ Co \left( NH _3\right)_6\right]^{3+}\),
(iii) \(\left[ NiCl _4\right]^{2-}\),
(iv) \(\left[ Cu \left( NH _3\right)_4\right]^{2+}\)

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

a

(ii) \(>\) (i) \(>\) (iii) \(>\) (iv)

b

(i) \(>\) (iii) \(>\) (iv) \(>\) (ii)

c

(ii) \(>\) (iii) \(>\) (i) \(>\) (iv)

d

(iii) \(>\) (iv) \(>\) (ii) \(>\) (i)

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Q18
PYQ

Match the List-I with List-II.

List-I

(Complexes)

List-II

(Hybridisation)

(A)

[Ni(CO)4]

(I)

sp3

(B)

[Cu(NH3)4]2+

(II)

dsp2

(C)

[Fe(NH3)6]2+

(III)

sp3d2

(D)

[Fe(H2O)6]2+

(IV)

d2sp3

Choose the correct answer from the options given below.

a

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

b

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

c

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

d

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

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Q19
PYQ

Match List-I with List-II.

List-I

(Complex ion)

List-II

(Electronic configuration)

(A) \({\left[\mathrm{Cr}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+}\) (I) t2g2eg0
(B) \({\left[\mathrm{Fe}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+}\) (II) t2g3eg0
(C) \({\left[\mathrm{Ni}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{2+}\) (III) t2g3eg2
(D) \({\left[\mathrm{V}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+}\) (IV) t2g6eg0

Choose the correct answer from the options given below:

a

\(\begin{matrix}\text{ A-IV, B-I, C-II, D-III }\end{matrix}\)

b

\(\begin{matrix}\text{ A-IV, B-III, C-I, D-II }\end{matrix}\)

c

\(\text{ A-II, B-III, C-IV, D-I }\)

d

\(\text{ A-III, B-II, C-IV, D-I }\)

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