The pair of compounds having metals in their highest oxidation state is:

M n O_{2}, F e {C l}_{3}

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{[M n O_{4}]}^{-}, C r O_{2} {C l}_{2}

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{[F e {(C N)}_{6}]}^{3 -}, [C o {(C N)}_{3}]

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{[N i {C l}_{4}]}^{2 -}, {[C o {C l}_{4}]}^{-}

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Solution

The correct option is A ${[M n O_{4}]}^{-}, C r O_{2} {C l}_{2}$
The highest $M n$ oxidation state is +7 found in $M n O_{4}^{-}$ .
$C r$ exhibits its highest oxidation state of +6 in $C r O_{2} C l_{2}$ .

Hence,option B is correct.

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