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JEE Main levelSingle correct optionDifficulty 2 of 3df135

The spin-only magnetic moment of the weak-field complex ion $[CoF X_{6}] X^{3 -}$ is:

A $2.83 BM$
B $4.90 BM$
C $0 BM$
D $3.87 BM$

Answer: B

Co is +3 (

3 d^{6}

). Weak-field

F X^{-}

gives a high-spin

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

arrangement with 4 unpaired electrons.

μ = 4 \times 6 = 4.90 BM

.

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