The magnetic moment of a complex ion is 2.83 BM. The complex ion is :

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The magnetic moment of a complex ion is 2.83 BM. The complex ion is :

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${[Cr {(H_{2} O)}_{6}]}^{3 +}$

${[Cu (CN)_{4}]}^{2 -}$

${[V {(H_{2} O)}_{6}]}^{3 +}$

${[{MnCl}_{4}]}^{2 -}$

answer is A.

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Detailed Solution

Since there are 2 unpaired electrons in ${[V {(H_{2} O)}_{6}]}^{3 +} [3 d^{2}]$ the value of B.M. is 2.83 $B.M. = \sqrt{n (n + 2)}$

$B M = \sqrt{2 (2 + 2)}$

$B. M. = 2.83$

Hence the correct option is A.

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