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Question:

The magnetic moment (spin only) of [NiCl₄]²⁻ is:

2.82 BM

1.41 BM

1.82 BM

5.46 BM

Solution:

Cl⁻ is a weak field ligand and therefore d⁸ ion will have two unpaired electrons.
μ = √n(n+2) = √2(4) = 2.82 BM.