Spin only magnetic moment of the following complexes
${[F e C 1_{4}]}^{2 -}, {[C o {(o x)}_{3}]}^{3 -}, M n O_{4}^{2 -}$

4.9, 0, 1.76 BM

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5.9, 1.73 BM

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1.73, 2.83, 0 BM

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2.83, 6,9,0 BM

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Solution

The correct option is A 4.9, 0, 1.76 BM
Ans. (1)
${[F e C 1_{4}]}^{2 -}$ Contain $F e^{+ 2}$ in tetrahedral complex. Its configuration is $e g^{2, 1}$ ${t_{2 g}}^{1, 1, 1}$ it has 4 unpaired
electron in ${[C o {(o x)}_{3}]}^{3 -}$ $C o^{+ 2}$
have configuration ${t_{2 g}}^{0, 0, 0}$ $e g^{0, 0}$
$M n O_{4}^{2 -}$ have Mn in +6 oxidation state and configuration of Mn is $e g^{1, 0}$ ${t_{2 g}}^{0, 0, 0}$

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${[F e C 1_{4}]}^{2 -}, {[C o {(o x)}_{3}]}^{3 -}, M n O_{4}^{2 -}$

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The complex with spin-only magnetic moment of 4.9 B.M. is

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