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JEE Main levelSingle correct optionDifficulty 2 of 3cc099

Taking $F X^{-}$ as a weak-field ligand (high spin), the spin-only magnetic moment of $[CoF X_{6}] X^{3 -}$ is

A4.90 BM
B2.83 BM
C3.87 BM
D0 BM

Answer: A

Co is +3,

d^{6}

. High spin gives

t_{2 g}^{4} e_{g}^{2}

with 4 unpaired electrons.

μ = 4 \times 6 = 24 = 4.90 BM

.

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