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Coordination Compounds · Question 29

JEE Main 2026 (Online) 22nd January Morning ShiftMCQMedium📈 Topic in 6% papers+4−1
1

A first row transition metal (M) does not liberate H2 gas from dilute HCl. 1 mol of aqueous solution of MSO4 is treated with excess of aqueous KCN and then H2S(g) is passed through the solution. The amount of MS (metal sulphide) formed from the above reaction is mol.

  1. 1
  2. 2
  3. 0
  4. 3

Answer

(3) 0

Solution

Among the 3d metals only Cu has a positive E M2+/M (+0.34 V) it does not liberate H2 from dilute HCl M = Cu, MSO4 = CuSO4.

With excess KCN, Cu2+ is reduced and forms the very stable complex:

2CuSO4 + 10KCN 2K3[Cu(CN)4] + 2K2SO4 + (CN)2

[Cu(CN)4]3- is so stable (very high stability constant) that it gives practically no free copper ions in solution.

On passing H2S, no CuS is precipitated (this is used to separate Cu2+ from Cd2+ in qualitative analysis).

Amount of MS formed = 0 mol

Answer: (3)

JEE Main 2026 (Online) 22nd January Morning Shift

Keep practising — Coordination Compounds

2

[Ni(PPh3)2Cl2] is a paramagnetic complex. Identify the INCORRECT statements about this complex. Choose the correct answer from the options given below :

  1. C and D Only
  2. A, B and D Only
  3. C, D and E Only
  4. A and B Only
JEE Main 2026 (Online) 22nd January Evening Shift
3

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

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are false
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
JEE Main 2026 (Online) 21st January Morning Shift
4

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

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Both Statement I and Statement II are false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 21st January Evening Shift
5

Identify the metal ions among Co2+, Ni2+, Fe2+, V3+ and Ti2+ having a spin-only magnetic moment value more than 3.0 BM. The sum of unpaired electrons present in the high spin octahedral complexes formed by those metal ions is .

JEE Main 2026 (Online) 21st January Evening Shift
6

Match the LIST-I with LIST-II Choose the correct answer from the options given below:

  1. A-I, B-II, C-III, D-IV
  2. A-IV, B-I, C-III, D-II
  3. A-III, B-II, C-I, D-IV
  4. A-III, B-IV, C-II, D-I
JEE Main 2025 (Online) 8th April Evening Shift
7

The number of species from the following that are involved in sp3d2 hybridization is : [Co(NH3)6]3+, SF6, [CrF6]3-, [CoF6]3-, [Mn(CN)6]3-, and [MnCl6]3-

  1. 4
  2. 3
  3. 5
  4. 6
JEE Main 2025 (Online) 8th April Evening Shift
8

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

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Both Statement I and Statement II are false
  4. Statement I is false but Statement II is true
JEE Main 2025 (Online) 8th April Evening Shift
9

An octahedral complex having molecular composition Co 5NH3 Cl SO4 has two isomers A and B. The solution of A gives a white precipitate with AgNO3 solution and the solution of B gives white precipitate with BaCl2 solution. The type of isomerism exhibited by the complex is,

  1. Co-ordinate isomerism
  2. Ionisation isomerism
  3. Geometrical isomerism
  4. Linkage isomerism
JEE Main 2025 (Online) 7th April Morning Shift
10

The number of paramagnetic complexes among [FeF6]3-, [Fe(CN)6]3-, [Mn(CN)6]3-, [Co(C2O4)3]3-, [MnCl6]3-, and [CoF6]3-, which involve d2sp3 hybridization is .

JEE Main 2025 (Online) 7th April Morning Shift
11

Match List - I with List - II. Choose the correct answer from the options given below :

  1. A-I, B-III, C-II, D-IV
  2. A-II, B-III, C-IV, D-I
  3. A-I, B-IV, C-IV, D-III
  4. A-III, B-I, C-II, D-IV
JEE Main 2025 (Online) 7th April Evening Shift

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