Redox Reactions And Electrochemistry Ques 773

Question: $ MnO_4^{2-} $ undergoes disproportionation reaction in acidic medium but $ MnO_4^{-} $ does not because

Options:

A) In $ MnO_4^{2-}Mn $ is in intermediate oxidation state

B) In $ MnO_4^{2-},Mn $ is in lowest oxidation state

C) In $ MnO_4^{2-},Mn $ is in intermediate oxidation state

D) None of the above

Show Answer

Answer:

Correct Answer: A

Solution:

[a] In $ MnO_4^{2-}, $ the oxidation number of $ Mn $ is + 6. It can increase its oxidation number (to + 7) or decrease its oxidation number (to + 4, + 3, + 2, 0).

Hence it undergoes disproprotion rection is acidic medium.

In $ MnO_4^{-},Mn $ is in its highest oxidation state i.e., +7. It can only decrease its oxidation number.

Hence, it cannot undergo disproportionation reaction.



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