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Coordination Compounds · Question 8

RE-NEET (UG) 2026MCQMedium📈 Topic in 12% papers+4−1
1

Among the species given below, the spin-only magnetic moment is highest for (Given: Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)

  1. [Ti(H2O)6]3+
  2. [Mn(CN)6]3-
  3. [Fe(CN)6]3-
  4. [Co(NH3)6]3+

Answer

(2) [Mn(CN)6]3-

Solution

1. [Ti(H2O)6]3+: Ti3+ (3d1), number of unpaired electrons n = 1, = 1(1+2) = 1.73 BM.

2. [Mn(CN)6]3-: Mn3+ (3d4), strong field ligand CN- causes pairing to give t2g4 eg0, n = 2, = 2(2+2) = 8 2.83 BM.

3. [Fe(CN)6]3-: Fe3+ (3d5), strong field ligand CN- gives t2g5 eg0, n = 1, = 1.73 BM.

4. [Co(NH3)6]3+: Co3+ (3d6), strong field ligand NH3 gives t2g6 eg0, n = 0, = 0.

Hence, [Mn(CN)6]3- has the highest spin-only magnetic moment. Answer: (2)

RE-NEET (UG) 2026

Keep practising — Coordination Compounds

2

Out of the following complex compounds, which of the compound will be having the minimum conductance solution?

  1. [Co(NH3)6]Cl3
  2. [Co(NH3)5Cl]Cl
  3. [Co(NH3)3Cl3]
  4. [Co(NH3)4Cl2]
NEET (UG) 2025
3

Which of the following are paramagnetic? Choose the correct answer from the options given below :

  1. A and D only
  2. A, D and E only
  3. A and C only
  4. B and E only
NEET (UG) 2025
4

The correct order of the wavelength of light absorbed by the following complexes is, A. [Co(NH3)6]3+ B. [Co(CN)6]3- C. [Cu(H2O)4]2+ D. [Ti(H2O)6]3+ Choose the correct answer from the options given below:

  1. C < D < A < B
  2. C < A < D < B
  3. B < D < A < C
  4. B < A < D < C
NEET (UG) 2025
5

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

  1. A-II, B-III, C-IV, D-I
  2. A-I, B-III, C-IV, D-II
  3. A-I, B-IV, C-III, D-II
  4. A-II, B-IV, C-III, D-I
NEET (UG) 2024
6

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below:

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
NEET (UG) 2024
7

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below.

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
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8

Ethylene diaminetetraacetate ion is a/an:

  1. hexadentate ligand
  2. ambidentate ligand
  3. monodentate ligand
  4. bidentate ligand
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9

Which of the following is not an ambidentate ligand?

  1. C2O42-
  2. SCN-
  3. NO2-
  4. CN-
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10

[ Mn2(CO)10] and [Co2(CO)8] structures have Choose the correct answer from the options given below

  1. Only A, B, C
  2. Only B, C, D
  3. Only A, C, D
  4. Only A, B, D
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11

Homoleptic complex from the following complexes is:

  1. Diamminechloridonitrito-N-platinum(II)
  2. Pentaamminecarbonatocobalt(III) chloride
  3. Triamminetriaquachromium(III) chloride
  4. Potassium trioxalatoaluminate(III)
NEET (UG) 2023

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