The magnetic moment of [NiCl_4]²- [Atomic number : Ni = 28] (A) 1.82 BM (B) 2.82 BM (C) 4.42 BM (D) 5.46 BM

ChemistryCBSE Class 12 · Board exam 2023, set 56/5/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2023: question 14

Set in the CBSE Class 12 board exam of 2023, paper 56/5/1, section A, question 14, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q14 · 1 mark · MCQCoordination Compounds

The magnetic moment of $[NiC l_{4}]^{2 -}$ [Atomic number : Ni = 28]

(A)1.82 BM
(B)2.82 BM
(C)4.42 BM
(D)5.46 BM

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 56/5/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Find the oxidation state of Ni and its d-electron count.

Hint 2

Cl⁻ is a weak-field ligand; then use the spin-only formula.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

$N i^{2 +}$ is $3 d^{8}$ . $C l^{-}$ is a weak-field ligand, so the complex is tetrahedral ( $s p^{3}$ ) with 2 unpaired electrons.
$μ = n (n + 2) = 8 = 2.82$ BM
1 mark

Answer: (B) 2.82 BM

Where the marks are

Takes n = 2 and calculates μ = 2.82 BM (1 mark)

Revise the chapter

Chapter: Coordination Compounds (notes, formulas, where marks are lost and every past question)

Practise this chapterBoard-style questions from Coordination Compounds, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 56/5/1: every question, by section.

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CBSE Class 12 Chemistry 2023: question 14

Hints

Step-by-step solution

Revise the chapter

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