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Coordination Compounds

JEE Main 2025 (Online) 2nd April Morning ShiftMCQEasy📈 Topic in 54% papers+4−1
Ques. 1JEE Main 2025, 2 April (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. Both Statement I and Statement II are incorrect
  2. Statement I is correct but Statement II is incorrect
  3. Statement I is incorrect but Statement II is correct
  4. Both Statement I and Statement II are correct

Answer

(4) Both Statement I and Statement II are correct

Solution

Statement I: If o < P (weak field ligand), the fourth electron enters an eg orbital ( t2g3 eg1) maximum unpaired electrons high spin.

If o > P (strong field ligand), pairing occurs in t2g ( t2g4 eg0) low spin. Statement I is correct.

Statement II: As per NCERT, t = 49 o, so the splitting is too small to force pairing.

t < P in practice, so low spin tetrahedral complexes are rarely formed. Statement II is correct.

Answer: (4)

Keep practising — Coordination Compounds

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

A transition metal (M) among Mn, Cr, Co and Fe has the highest standard electrode potential (M3+/M2+). It forms a metal complex of the type [M(CN)6]4-. The number of electrons present in the eg orbital of the complex is .

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

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