WBJEE PYQs for Coordination Compounds with Solutions: Practice WBJEE Previous Year Questions

Updated 3+ months ago

Coordination Compounds is an important topic in the Chemistry section in WBJEE exam. Practising this topic will increase your score overall and make your conceptual grip on WBJEE exam stronger.

This article gives you a full set of WBJEE PYQs for Coordination Compounds with explanations for effective preparation. Practice of WBJEE Chemistry PYQs including Coordination Compounds questions regularly will improve accuracy, speed, and confidence in the WBJEE 2026 exam.

WBJEE PYQs for Coordination Compounds with Solutions

1.
Oxidation states of Cr in K2Cr2O7 and CrO5 are, respectively:
- +6, +5
- +6, +10
- +6, +6
- None of these
View Solution
2.
Which of the following statements is incorrect?
- [VF₆]^3- is paramagnetic with 2 unpaired electrons.
- [CuCl₄]^2- is paramagnetic with 1 unpaired electron.
- [Co(NH₃)₆]³⁺ is diamagnetic
- [CoF₆]^3- is paramagnetic with 2 unpaired electrons.
View Solution
3.
The solubility product of silver chloride is 1.8 × 10^-10 at 298 k. The solubility of AgCl in 0.01 M KCl aqueous solution in mol dm^-3 is
- (A) 9.0 × 10^-9
- (B) 1.8 × 10^-8
- (C) 3.6 × 10^-8
- (D) 2.4 × 10^-9
View Solution
4.
(i)
(ii)
(iii)

The relationship between the pair of compounds shown above is respectively,
- enantiomer,diastereomer,diastereomer
- enantiomer,enantiomer,diastereomer
- enantiomer,homomer(identical),diastereomer

homomer(identical), diastereomer,geometrical isomer

View Solution

5.
The number of unpaired electrons in $\left[NiCl_{4}\right]^{2-}, Ni\left(CO\right)_{4}$ and $\left[Cu\left(NH_{3}\right)_{4}\right]^{2+}$ respectively are :

$2, 2, 1$
$2, 0, 1$
$0, 2, 1$
$2, 2, 0$

View Solution

6.
Sodium nitroprusside is:

Na4[Fe(CN)5 NO2]
Na2[Fe(CN)5NO]
Na3[Fe(CN)5NO]
Na4[Fe(CN)5NO3]

View Solution

7.
The spin-only magnetic moment of $\left[crF_{6}\right]^{4-}$ (atomic number of Cr is 24) is

0
1.73 BM
2.83 BM
4.9 BM

View Solution

8.
The longest wavelength in A^o in the Balmer series of singly ionised helium ion, He⁺ is

(A) 6565 A^o
(B) 912 A^o
(C) 60932.2 A^o
(D) 1641 A^o

View Solution

9.
The correct statement about the magnetic properties of [Fe(CN)₆]^3- and [FeF₆]^3- is

Both are paramagnetic
Both are diamagnetic
[Fe(CN)₆]^3- is diamagnetic,[FeF₆]^3- is paramagnetic
[Fe(CN)₆]^3- is paramagnetic,[FeF₆]^3- is diamagnetic

View Solution

10.
In the complex ion $\left[Cu\left(CN\right)_{4}\right]^{3-}$ the hybridization state, oxidation state and number of unpaired electrons of copper are respectively

$dsp^{2},+1,1$
$sp^{3},+1,Zero$
$sp^{3},+2,1$
$dsp^{3}, +2, Zero$

View Solution

11.
In $Cu$-ammonia complex, the state of hybridization of $Cu^{+2}$ is

$sp^{3}$
$d^{3}s$
$sp^{2}f$
$dsp^{2}$

View Solution

12.
Compounds with spin-only magnetic moment equivalent to five unpaired electrons are

$K_{4}\left[Mn\left(CN\right)_{6}\right]$
$\left[Fe\left(H_{2}O\right)_{6}\right]Cl_{3}$
$K_{3}\left[FeF_{6}\right]$
$K_{4}\left[MnF_{6}\right]$

View Solution

13.
Cold ferrous sulphate solution on absorption of $NO$ develops brown colour due to the formation of

paramagnetic $[Fe(H_2O)_5(NO)]SO_4$
diamagnetic $[Fe(H_2O)_5(N_3)]SO_4$
paramagnetic $[Fe(H_2O)_5(NO_3)](SO_4)_2$
diamagnetic $[Fe(H_2O)_4(SO_4)]NO_3$

View Solution

14.
Which of the following species exhibits both LMCT and paramagnetism?

MnO⁻₄
MnO²⁻₄
Cr₂O²⁻₇
CrO²⁻₄

View Solution

15.
Amongst $\left[NiCl_{4}\right]^{2-}, \left[Ni\left(H_{2}O\right)_{6}\right]^{2+},\left[Ni\left(PPh_{3}\right)_{2}Cl_{2}\right], \left[Ni\left(CO\right)_{4}\right]$ and $\left[Ni\left(CN\right)_{4}\right]^{2-}$. the paramagnetic species are

$\left[NiCl_{4}\right]^{2-}, \left[Ni\left(H_{2}O\right)_{6}\right]^{2+},\left[Ni\left(PPh_{3}\right)_{2}Cl_{2}\right]$
$\left[Ni\left(CO\right)_{4}\right],\left[Ni\left(PPh_{3}\right)_{2}Cl_{2}\right],\left[NiCl_{4}\right]^{2-}$
$\left[Ni\left(CN\right)_{4}\right]^{2-}, \left[Ni\left(H_{2}O\right)_{6}\right]^{2+},\left[NiCl_{4}\right]^{2-}$
$\left[Ni\left(PPh_{3}\right)_{2}Cl_{2}\right], \left[Ni\left(CO\right)_{4}\right],\left[Ni\left(CN\right)_{4}\right]^{2-}$

View Solution

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WBJEE PYQs for Coordination Compounds with Solutions

1. Oxidation states of Cr in K2Cr2O7 and CrO5 are, respectively:

2.Which of the following statements is incorrect?

3.The solubility product of silver chloride is 1.8 × 10-10 at 298 k. The solubility of AgCl in 0.01 M KCl aqueous solution in mol dm-3 is

4.(i)(ii)(iii) The relationship between the pair of compounds shown above is respectively,

5.The number of unpaired electrons in $\left[NiCl_{4}\right]^{2-}, Ni\left(CO\right)_{4}$ and $\left[Cu\left(NH_{3}\right)_{4}\right]^{2+}$ respectively are :

6. Sodium nitroprusside is:

7.The spin-only magnetic moment of $\left[crF_{6}\right]^{4-}$ (atomic number of Cr is 24) is

8.The longest wavelength in Ao in the Balmer series of singly ionised helium ion, He+ is

9.The correct statement about the magnetic properties of [Fe(CN)6]3- and [FeF6]3- is

10.In the complex ion $\left[Cu\left(CN\right)_{4}\right]^{3-}$ the hybridization state, oxidation state and number of unpaired electrons of copper are respectively

11.In $Cu$-ammonia complex, the state of hybridization of $Cu^{+2}$ is

12.Compounds with spin-only magnetic moment equivalent to five unpaired electrons are

13.Cold ferrous sulphate solution on absorption of $NO$ develops brown colour due to the formation of

14.Which of the following species exhibits both LMCT and paramagnetism?

15.Amongst $\left[NiCl_{4}\right]^{2-}, \left[Ni\left(H_{2}O\right)_{6}\right]^{2+},\left[Ni\left(PPh_{3}\right)_{2}Cl_{2}\right], \left[Ni\left(CO\right)_{4}\right]$ and $\left[Ni\left(CN\right)_{4}\right]^{2-}$. the paramagnetic species are

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1.
Oxidation states of Cr in K2Cr2O7 and CrO5 are, respectively:

2.
Which of the following statements is incorrect?

3.
The solubility product of silver chloride is 1.8 × 10^-10 at 298 k. The solubility of AgCl in 0.01 M KCl aqueous solution in mol dm^-3 is

4.
(i)
(ii)
(iii)

The relationship between the pair of compounds shown above is respectively,

5.
The number of unpaired electrons in $\left[NiCl_{4}\right]^{2-}, Ni\left(CO\right)_{4}$ and $\left[Cu\left(NH_{3}\right)_{4}\right]^{2+}$ respectively are :

6.
Sodium nitroprusside is:

7.
The spin-only magnetic moment of $\left[crF_{6}\right]^{4-}$ (atomic number of Cr is 24) is

8.
The longest wavelength in A^o in the Balmer series of singly ionised helium ion, He⁺ is

9.
The correct statement about the magnetic properties of [Fe(CN)₆]^3- and [FeF₆]^3- is

10.
In the complex ion $\left[Cu\left(CN\right)_{4}\right]^{3-}$ the hybridization state, oxidation state and number of unpaired electrons of copper are respectively

11.
In $Cu$-ammonia complex, the state of hybridization of $Cu^{+2}$ is

12.
Compounds with spin-only magnetic moment equivalent to five unpaired electrons are

13.
Cold ferrous sulphate solution on absorption of $NO$ develops brown colour due to the formation of

14.
Which of the following species exhibits both LMCT and paramagnetism?

15.
Amongst $\left[NiCl_{4}\right]^{2-}, \left[Ni\left(H_{2}O\right)_{6}\right]^{2+},\left[Ni\left(PPh_{3}\right)_{2}Cl_{2}\right], \left[Ni\left(CO\right)_{4}\right]$ and $\left[Ni\left(CN\right)_{4}\right]^{2-}$. the paramagnetic species are