Redox Reactions And Electrochemistry Ques 773

Question: MnO42 undergoes disproportionation reaction in acidic medium but MnO4 does not because

Options:

A) In MnO42Mn is in intermediate oxidation state

B) In MnO42,Mn is in lowest oxidation state

C) In MnO42,Mn is in intermediate oxidation state

D) None of the above

Show Answer

Answer:

Correct Answer: A

Solution:

[a] In MnO42, 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 MnO4,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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