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Coordination Compounds

JEE Main 2025 (Online) 3rd April Morning ShiftMCQEasy📈 Topic in 10% papers+4−1
Ques. 1JEE Main 2025, 3 April (Morning Shift)

The correct order of the complexes [Co(NH3)5(H2O)]3+ (A), [Co(NH3)6]3+ (B), [Co(CN)6]3- (C) and [CoCl(NH3)5]2+ (D) in terms of wavelength of light absorbed is

  1. D > C > B > A
  2. C > B > A > D
  3. D > A > B > C
  4. C > B > D > A

Answer

(3) D > A > B > C

Solution

All four are octahedral Co3+ complexes; they differ only in the ligands.

Spectrochemical series: Cl- < H2O < NH3 < CN-

Crystal field splitting: o (C) > o (B) > o (A) > o (D)

(B has six NH3; A has one NH3 replaced by the weaker H2O; D has one NH3 replaced by the still weaker Cl-.)

o = hc 1 o

Wavelength of light absorbed: D > A > B > C

Answer: (3)

Keep practising — Coordination Compounds

Ques. 2JEE Main 2025, 3 April (Morning Shift)

The number of optical isomers exhibited by the iron complex (A) obtained from the following reaction is . FeCl3 + KOH + H2C2O4 A

Ques. 3JEE Main 2025, 3 April (Evening Shift)

Identify the diamagnetic octahedral complex ions from below ; Choose the correct answer from the options given below:

  1. B and C Only
  2. A and C Only
  3. B and D Only
  4. A and D Only
Ques. 4JEE 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
Ques. 5JEE 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. 6JEE 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. 7JEE 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. 8JEE 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. 9JEE 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. 10JEE 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. 11JEE 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.

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