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Coordination Compounds

JEE Main 2025 (Online) 24th January Morning ShiftMCQEasy📈 Topic in 13% papers+4−1
Ques. 1JEE Main 2025, 24 January (Morning Shift)

One mole of the octahedral complex compound Co(NH3)5Cl3 gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with excess of AgNO3 solution to yield two moles of AgCl(s). The structure of the complex is:

  1. [Co(NH3)5Cl]Cl2
  2. [Co(NH3)4Cl] Cl2 NH3
  3. [Co(NH3)3Cl3] 2NH3
  4. [Co(NH3)4Cl2] Cl NH3

Answer

(1) [Co(NH3)5Cl]Cl2

Solution

Only ions outside the bracket ionise / give AgCl: 2 AgCl 2 Cl- outside, 1 Cl inside.

Octahedral: 5 NH3 + 1 Cl inside.

[Co(NH3)5Cl]Cl2 [Co(NH3)5Cl]2+ + 2Cl- (3 ions)

Answer: (1)

Keep practising — Coordination Compounds

Ques. 2JEE Main 2025, 24 January (Evening Shift)

The conditions and consequence that favours the t2g3eg1 configuration in a metal complex are :

  1. strong field ligand, low spin complex
  2. strong field ligand, high spin complex
  3. weak field ligand, high spin complex
  4. weak field ligand, low spin complex
Ques. 3JEE Main 2025, 24 January (Evening Shift)

When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be:

  1. Pale Blue Blue Green Violet
  2. Pale Blue Blue Violet Green
  3. Green Pale Blue Blue Violet
  4. Violet Blue Pale Blue Green
Ques. 4JEE Main 2025, 23 January (Morning Shift)

The d-electronic configuration of an octahedral Co (II) complex having magnetic moment of 3.95 BM is:

  1. e4t23
  2. t2g6eg1
  3. t2g5eg2
  4. t2g3eg0
Ques. 5JEE Main 2025, 23 January (Morning Shift)

The complex that shows Facial - Meridional isomerism is :

  1. [Co(en)2Cl2]+
  2. [Co(NH3)3Cl3]
  3. [Co(NH3)4Cl2]+
  4. [Co(en)3]3+
Ques. 6JEE Main 2025, 23 January (Evening Shift)

Identify the coordination complexes in which the central metal ion has d4 configuration. Choose the correct answer from the options given below :

  1. B, C and D only
  2. C and E only
  3. A, B and E only
  4. B and D only
Ques. 7JEE Main 2025, 22 January (Morning Shift)

From the magnetic behaviour of [NiCl4]2- (paramagnetic) and [Ni(CO)4] (diamagnetic), choose the correct geometry and oxidation state.

  1. [NiCl4]2- : Ni(0), tetrahedral [Ni(CO)4] : Ni(0), square planar
  2. [NiCl4]2- : NiII, tetrahedral [Ni(CO)4] : Ni(0), tetrahedral
  3. [NiCl4]2- : NiII, tetrahedral [Ni(CO)4] : NiII, square planar
  4. [NiCl4]2- : NiII, square planar [Ni(CO)4] : Ni(0), square planar
Ques. 8JEE Main 2025, 22 January (Morning Shift)

In which of the following complexes the CFSE, o will be equal to zero?

  1. K3[Fe(SCN)6]
  2. [Fe(en)3]Cl3
  3. [Fe(NH3)6]Br2
  4. K4[Fe(CN)6]
Ques. 9JEE Main 2025, 22 January (Evening Shift)

The correct order of the following complexes in terms of their crystal field stabilization energies is :

  1. [Co(NH3)4]2+ < [Co(NH3)6]2+ < [Co(NH3)6]3+ < [Co(en)3]3+
  2. [Co(NH3)4]2+ < [Co(NH3)6]2+ < [Co(en)3]3+ < [Co(NH3)6]3+
  3. [Co(NH3)6]2+ < [Co(NH3)6]3+ < [Co(NH3)4]2+ < [Co(en)3]3+
  4. [Co(en)3]3+ < [Co(NH3)6]3+ < [Co(NH3)6]2+ < [Co(NH3)4]2+
Ques. 10JEE Main 2025, 22 January (Evening Shift)

Identify the homoleptic complex(es) that is/are low spin. Choose the correct answer from the options given below :

  1. C and D only
  2. C only
  3. A and C only
  4. B and E only
Ques. 11JEE Main 2025, 22 January (Evening Shift)

The complex of Ni2+ ion and dimethyl glyoxime contains number of Hydrogen (H) atoms.

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