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Coordination Compounds

JEE Main 2024 (Online) 4th April Morning ShiftMCQMedium📈 Topic in 54% papers+4−1
Ques. 1JEE Main 2024, 4 April (Morning Shift)

Number of complexes from the following with even number of unpaired "d" electrons is [V(H2O)6]3+, [Cr(H2O)6]2+, [Fe(H2O)6]3+, [Ni(H2O)6]3+, [Cu(H2O)6]2+ [Given atomic numbers: V = 23, Cr = 24, Fe = 26, Ni = 28, Cu = 29]

  1. 1
  2. 5
  3. 2
  4. 4

Answer

(3) 2

Solution

H2O is a weak field ligand ⇒ no pairing (high spin) ⇒ unpaired e⁻ = number of singly filled d orbitals

V3+: 3d2 ⇒ 2 unpaired (even)

Cr2+: 3d4 ⇒ 4 unpaired (even)

Fe3+: 3d5 ⇒ 5 unpaired (odd)

Ni3+: 3d7 ⇒ 3 unpaired (odd)

Cu2+: 3d9 ⇒ 1 unpaired (odd)

∴ Even number of unpaired d electrons: [V(H2O)6]3+ and [Cr(H2O)6]2+ = 2

Answer: (3)

Keep practising — Coordination Compounds

Ques. 2JEE Main 2024, 4 April (Morning Shift)

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

  1. NCS- > EDTA4- > CN- > CO
  2. CO > H2O > F- > S2-
  3. S2- > -OH > EDTA4- > CO
  4. -OH > F- > NH3 > CN-
Ques. 3JEE Main 2024, 4 April (Evening Shift)

If an iron (III) complex with the formula [Fe(NH3)x(CN)y]- has no electron in its eg orbital, then the value of x + y is

  1. 6
  2. 4
  3. 3
  4. 5
Ques. 4JEE Main 2024, 4 April (Evening Shift)

The number of unpaired d-electrons in [Co(H2O)6]3+ is .

  1. 0
  2. 2
  3. 1
  4. 4
Ques. 5JEE Main 2024, 1 February (Morning Shift)

Which of the following complex is homoleptic?

  1. [Ni(NH3)2Cl2]
  2. [Co(NH3)4Cl2]+
  3. [Fe(NH3)4Cl2]+
  4. [Ni(CN)4]2-
Ques. 6JEE Main 2024, 1 February (Morning Shift)

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

  1. Statement I is incorrect but Statement II is correct
  2. Both Statement I and Statement II are correct
  3. Both Statement I and Statement II are incorrect
  4. Statement I is correct but Statement II is incorrect
Ques. 7JEE Main 2024, 1 February (Evening Shift)

[Co(NH3)6]3+ and [CoF6]3- are respectively known as :

  1. Inner orbital Complex, Spin paired Complex
  2. Spin paired Complex, Spin free Complex
  3. Spin free Complex, Spin paired Complex
  4. Outer orbital Complex, Inner orbital Complex
Ques. 8JEE Main 2024, 31 January (Morning Shift)

The correct statements from following are: Choose the correct answer from the options given below:

  1. B, C only
  2. B, D only
  3. A, C only
  4. A, D only
Ques. 9JEE Main 2024, 31 January (Morning Shift)

The 'Spin only' Magnetic moment for [Ni(NH3)6]2+ is 10-1 BM. (given = Atomic number of Ni : 28)

Ques. 10JEE Main 2024, 31 January (Evening Shift)

Select the option with correct property -

  1. [Ni(CO)4] and [NiCl4]2- both Paramagnetic
  2. [Ni(CO)4] and [NiCl4]2- both Diamagnetic
  3. [NiCl4]2- Diamagnetic, [Ni(CO)4] Paramagnetic
  4. [Ni(CO)4] Diamagnetic, [NiCl4]2- Paramagnetic
Ques. 11JEE Main 2024, 31 January (Evening Shift)

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

  1. A-IV, B-I, C-II, D-III
  2. A-III, B-II, C-IV, D-I
  3. A-II, B-III, C-IV, D-I
  4. A-IV, B-III, C-I, D-II

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