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Coordination Compounds

JEE Main 2025 (Online) 2nd April Evening ShiftMCQEasy📈 Topic in 37% papers+4−1
Ques. 1JEE Main 2025, 2 April (Evening Shift)

The type of hybridization and the magnetic property of [MnCl6]3- are,

  1. sp3d2, paramagnetic with four unpaired electrons.
  2. d2sp3, paramagnetic with four unpaired electrons.
  3. sp3d2, paramagnetic with two unpaired electrons.
  4. d2sp3, paramagnetic with two unpaired electrons.

Answer

(1) sp3d2, paramagnetic with four unpaired electrons.

Solution

Oxidation state of Mn: x + 6(-1) = -3 x = +3

Mn3+: [Ar] 3d4

Cl- is a weak-field ligand, so the 3d electrons do not pair: 4 unpaired electrons remain in 3d.

The six ligand pairs go into 4s, 4p and 4d orbitals sp3d2 (outer orbital, high spin, octahedral).

= 4(4+2) = 4.9 BM paramagnetic with four unpaired electrons.

Answer: (1)

Keep practising — Coordination Compounds

Ques. 2JEE Main 2025, 2 April (Evening Shift)

The d-orbital electronic configuration of the complex among [Co(en)3]3+, [CoF6]3-, [Mn(H2O)6]2+ and [Zn(H2O)6]2+ that has the highest CFSE is:

  1. t2g6eg0
  2. t2g3eg2
  3. t2g4eg2
  4. t2g6eg4
Ques. 3JEE Main 2025, 29 January (Morning Shift)

The correct increasing order of stability of the complexes based on 0 value is : I. [Mn(CN)6]3- II. [Co(CN)6]4- III. [Fe(CN)6]4- IV. [Fe(CN)6]3-

  1. I < II < IV < III
  2. IV < III < II < I
  3. III < II < IV < I
  4. II < III < I < IV
Ques. 4JEE Main 2025, 29 January (Morning Shift)

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

  1. (A)-(III), (B)-(I), (C)-(I), (D)-(IV)
  2. (A)-(III), (B)-(II), (C)-(III), (D)-(IV)
  3. (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
  4. (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
Ques. 5JEE Main 2025, 29 January (Evening Shift)

Identify the homoleptic complexes with odd number of d electrons in the central metal : Choose the correct answer from the options given below :

  1. (C) and (E) only
  2. (A), (B) and (D) only
  3. (B) and (D) only
  4. (A), (C) and (E) only
Ques. 6JEE Main 2025, 29 January (Evening Shift)

The calculated spin-only magnetic moments K3[Fe(OH)6] and K4[Fe(OH)6] respectively are :

  1. 4.90 and 4.90 B.M.
  2. 4.90 and 5.92 B.M.
  3. 5.92 and 4.90 B.M.
  4. 3.87 and 4.90 B.M.
Ques. 7JEE Main 2025, 29 January (Evening Shift)

Consider the following low-spin complexes K3[Co(NO2)6], K4[Fe(CN)6], K3[Fe(CN)6], Cu2[Fe(CN)6] and Zn2[Fe(CN)6] The sum of the spin-only magnetic moment values of complexes having yellow colour is B.M. (answer in nearest integer)

Ques. 8JEE Main 2025, 28 January (Evening Shift)

Match 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)-(III), (B)-(IV), (C)-(I), (D)-(II)
  3. (A)-(I), (B)-(IV), (C)-(III), (D)-(II)
  4. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
Ques. 9JEE 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
Ques. 10JEE 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. 11JEE 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

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