Among the following, the species that is both paramagnetic and coloured is :

[M n O_{4}]^{2 -}

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[T i C l_{6}]^{2 -}

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[V O_{4}]^{3 -}

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C r O_{2} C l_{2}

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[M n O_{4}]^{-}

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Solution

The correct option is A $[M n O_{4}]^{2 -}$
$[M n O_{4}]^{2 -}$ Mn is in +6 oxidation state. Electronic configuration is $[A r]^{18} 3 d^{1} 4 s^{0} .$ As it contains one unpaired electron it is paramagnetic and green colored because of d-d transition in the visible region.
$[T i C l_{6}]^{2 -}$ , $[V O_{4}]^{3 -}$ , $[M n O_{4}]^{-}$ and $C r O_{2} C l_{2}$ are diamagnetic because all electrons are paired.

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