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JEE Advanced levelSingle correct optionDifficulty 3 of 3df150

In $K X_{3} [Mn (CN) X_{6}]$ , cyanide is a strong-field ligand giving a low-spin octahedral complex. The oxidation state of Mn and the spin-only magnetic moment of the complex anion are:

A+3; 4.90 BM
B+3; 0 BM
C+3; 2.83 BM
D+2; 1.73 BM

Answer: C

Charge:

x - 6 = - 3

gives Mn(III),

3 d^{4}

. Low spin

t_{2 g}^{4} e_{g}^{0}

has 2 unpaired electrons.

μ = 2 \times 4 = 2.83 BM

.

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