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JEE Main levelSingle correct optionDifficulty 2 of 3df127

The spin-only magnetic moment of the low-spin complex ion $[Fe (CN) X_{6}] X^{3 -}$ is:

A $5.92 BM$
B $0 BM$
C $1.73 BM$
D $3.87 BM$

Answer: C

Fe is +3 (

3 d^{5}

). With strong-field

CN X^{-}

the electrons pair up as

t_{2 g}^{5} e_{g}^{0}

, leaving 1 unpaired electron.

μ = 3 = 1.73 BM

.

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