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

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

(1) ClO2-, F2, MnO4- and Cr2O72-

(2)Cr2O72-, MnO4-, ClO2- and Cl2

(3) MnO4-, ClO2-, Cl2 and Mn3+

(4) ClO2-, MnO4-, ClO2- and F2

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Correct answer: (3) MnO4-, ClO2-, Cland Mn3+

Explanation:

all species that show disproportionation reaction.

MnO4-

Mn is in +7 oxidation state (highest) hence cannot be simultaneously oxidized or reduced.

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