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Coordination Compounds · Question 1

JEE Main 2026 (Online) 8th April Evening ShiftNumericalMedium📈 Topic in 55% papers+4
1

Number of paramagnetic complexes among the following is . [MnBr4]2-, [NiCl4]2-, [Ni(CN)4]2-, [Ni(CO)4], [CoF6]3-, [Fe(CN)6]4-, [Mn(CN)6]3-, [Ti(CN)6]3-, [Cu(H2O)6]2+, [Co(C2O4)3]3-

Answer

6

Solution

[MnBr4]2-: Mn2+, 3d5, tetrahedral ⇒ 5 unpaired ⇒ paramagnetic

[NiCl4]2-: Ni2+, 3d8, sp3 ⇒ 2 unpaired ⇒ paramagnetic

[Ni(CN)4]2-: Ni2+, 3d8, strong field, dsp2 ⇒ 0 unpaired ⇒ diamagnetic

[Ni(CO)4]: Ni(0), 3d10 ⇒ diamagnetic

[CoF6]3-: Co3+, 3d6, weak field ( t2g4eg2) ⇒ 4 unpaired ⇒ paramagnetic

[Fe(CN)6]4-: Fe2+, 3d6, strong field ( t2g6) ⇒ diamagnetic

[Mn(CN)6]3-: Mn3+, 3d4, strong field ( t2g4) ⇒ 2 unpaired ⇒ paramagnetic

[Ti(CN)6]3-: Ti3+, 3d1 ⇒ 1 unpaired ⇒ paramagnetic

[Cu(H2O)6]2+: Cu2+, 3d9 ⇒ 1 unpaired ⇒ paramagnetic

[Co(C2O4)3]3-: Co3+, 3d6, low spin ( t2g6) ⇒ diamagnetic

∴ Number of paramagnetic complexes = 6

Answer: 6

JEE Main 2026 (Online) 8th April Evening Shift

Keep practising — Coordination Compounds

2

Match the LIST-I with LIST-II

  1. A-III, B-IV, C-II, D-I
  2. A-III, B-I, C-IV, D-II
  3. A-III, B-IV, C-I, D-II
  4. A-II, B-I, C-IV, D-III
JEE Main 2026 (Online) 6th April Morning Shift
3

Which of the following are true about the energy of the given d-orbitals of a tetrahedral complex? Choose the correct answer from the options given below :

  1. A, B and D only
  2. A and B only
  3. B and D only
  4. B, C and D only
JEE Main 2026 (Online) 6th April Morning Shift
4

Which of the following sequences of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ? Choose the correct answer from the options given below :

  1. A, B, C and D
  2. B, C and D only
  3. A, C and D only
  4. A, B and D only
JEE Main 2026 (Online) 6th April Evening Shift
5

An excess of AgNO3 is added to 100 mL of a 0.05 M solution of tetraaquadichloridochromium (III) chloride. The number of moles of AgCl precipitated will be 10-3. (Nearest integer)

JEE Main 2026 (Online) 6th April Evening Shift
6

The correct statements about metal carbonyls are Choose the correct answer from the options given below :

  1. A and B Only
  2. A, C and D Only
  3. B and C Only
  4. A and D Only
JEE Main 2026 (Online) 5th April Morning Shift
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 correct
  2. Both Statement I and Statement II are incorrect
  3. Statement I is correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct
JEE Main 2026 (Online) 5th April Morning Shift
8

Identify the correct statements from the following Choose the correct answer from the options given below :

  1. A, B, C, D and E
  2. B, C and D only
  3. A, C and D only
  4. A, C and E only
JEE Main 2026 (Online) 5th April Evening Shift
9

The total number of unpaired electrons present in the d3, d4 (low spin) d5 (high spin), d6 (high spin) and d7 (low spin) octahedral complex systems is .

JEE Main 2026 (Online) 5th April Evening Shift
10

Consider the metal complexes [Ni(en)3]2+ (A), [NiCl4]2- (B) and [Ni(NH3)6]2+ (C). Choose the CORRECT option by considering the number of unpaired electrons present in (A), (B) and (C) respectively and the order of frequency of absorption.

  1. 2, 2, 2 and (A) > (C) > (B)
  2. 0, 2, 0 and (A) > (C) > (B)
  3. 2, 2, 0 and (B) > (C) > (A)
  4. 2, 2, 2 and (C) > (A) > (B)
JEE Main 2026 (Online) 4th April Evening Shift
11

Match List - I with List - II.

  1. A-I, B-II, C-III, D-IV
  2. A-II, B-III, C-IV, D-I
  3. A-III, B-IV, C-I, D-II
  4. A-IV, B-I, C-II, D-III
JEE Main 2026 (Online) 2nd April Morning Shift

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