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Coordination Compounds · Question 4

JEE Main 2026 (Online) 6th April Evening ShiftMCQEasy📈 Topic in 42% papers+4−1
1

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

Answer

(4) A, B and D only

Solution

A. [NiCl4]2-: Ni2+, 3d8; Cl- is weak ⇒ no pairing ⇒ sp3, tetrahedral, 2 unpaired e ⇒ paramagnetic ✓

B. [Ni(NH3)6]2+: Ni2+, 3d8; the two unpaired 3d electrons cannot be paired, so no inner d orbital is free ⇒ outer 4s, 4p, 4d orbitals used ⇒ sp3d2 (outer orbital), octahedral, 2 unpaired e ⇒ paramagnetic ✓

C. [Ni(CO)4]: Ni(0), 3d84s2; CO is strong ⇒ 4s electrons pushed into 3d ⇒ 3d10, sp3, tetrahedral, no unpaired e ⇒ diamagnetic ✗ (not paramagnetic)

D. [Ni(CN)4]2-: Ni2+, 3d8; CN- is strong ⇒ pairing ⇒ dsp2, square planar, diamagnetic ✓

∴ A, B and D only

Answer: (4)

JEE Main 2026 (Online) 6th April Evening Shift

Keep practising — Coordination Compounds

2

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
3

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
4

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
5

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
6

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
7

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
8

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
9

5.33 g of CrCl3 6H2O, which is a 1 : 3 electrolyte, is dissolved in water and is passed through a cation exchanger. The chloride ions in the eluted solution, on treatment with AgNO3 results in 8.61 g of AgCl. The ratio of moles of complex reacted and moles of AgCl formed is 10-2. (Nearest integer) [Molar mass in g mol-1 Cr : 52, Ag : 108, Cl : 35.5, H : 1, O : 16]

JEE Main 2026 (Online) 2nd April Morning Shift
10

Which of the following complexes will show coordination isomerism? Choose the correct answer from the options given below:

  1. B, C and D Only
  2. B, D and E Only
  3. A, C and D Only
  4. C, D and E Only
JEE Main 2026 (Online) 2nd April Evening Shift
11

The correct statement among the following is:

  1. [Ni(CN)4]2- and [NiCl4]2- are diamagnetic and Ni(CO)4 is paramagnetic.
  2. Ni(CO)4 is diamagnetic and [NiCl4]2- and [Ni(CN)4]2- are paramagnetic.
  3. Ni(CO)4 and [NiCl4]2- are diamagnetic and [Ni(CN)4]2- is paramagnetic.
  4. Ni(CO)4 and [Ni(CN)4]2- are diamagnetic and [NiCl4]2- is paramagnetic.
JEE Main 2026 (Online) 28th January Morning Shift

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