Which one of the following ions exhibits d-d transition and paramagnetism as well?

M n O_{4}^{-}

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C r_{2} O_{7}^{2 -}

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C r O_{4}^{2 -}

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M n O_{4}^{2 -}

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Solution

The correct option is D $M n O_{4}^{2 -}$
$M n O_{4}^{2 -}$ = $M n^{6 +}$ = $[A r] 3 d^{1}$
unpaired electron =1 , hence it is paramagnetic.

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