In which one of the following sets all species show disproportionation reaction?

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${C l O}_{4}^{-}, {M n O}_{4}^{-}, {C l O}_{2}^{-}$ and $F_{2}$

${M n O}_{4}^{-}, {C l O}_{2}^{-}, {C l}_{2}$ and ${M n}^{3 +}$

${C l O}_{2}^{-}, F_{2}, {M n O}_{4}^{-}$ and ${Cr}_{2} O_{7}^{- 2}$

${C r}_{2} O_{7}^{2 -}, {M n O}_{4}^{-}, {C l O}_{2}^{-}$ and ${C l}_{2}$

answer is B.

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Detailed Solution

In ${M n O}_{4}^{-}$ the oxidation state of Mn is +7.

In ${C l O}_{2}^{-}$ the oxidation state of Cl is +4.

In ${C l}_{2}$ the oxidation state of Cl is 0.

In ${M n}^{3 +}$ oxidation state of Mn is +3.

Here none of the option is in its minimum or maximum oxidation state hence all show disproportionate reaction.

Hence option B is the correct answer.

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