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Coordination Compounds

JEE Main 2025 (Online) 29th January Morning ShiftMCQMedium📈 Topic in 54% papers+4−1
Ques. 1JEE 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

Answer

(1) I < II < IV < III

Solution

CN- is a strong-field ligand all four complexes are low spin.

CFSE = (-0.4 x + 0.6 y) 0 for t2gx egy

I. Mn3+, 3d4: t2g4 eg0 CFSE = -1.6 0

II. Co2+, 3d7: t2g6 eg1 CFSE = -2.4 + 0.6 = -1.8 0

III. Fe2+, 3d6: t2g6 eg0 CFSE = -2.4 0

IV. Fe3+, 3d5: t2g5 eg0 CFSE = -2.0 0

Greater the magnitude of CFSE, greater the stability.

Stability: I < II < IV < III

Answer: (1)

Keep practising — Coordination Compounds

Ques. 2JEE 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. 3JEE 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. 4JEE 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. 5JEE 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. 6JEE 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. 7JEE 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. 8JEE 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. 9JEE 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. 10JEE 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. 11JEE 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+

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