Question

Which of the given reactions is not an example of disproportionation reaction?

• A. $2 H _2 O _2 \rightarrow 2 H _2 O + O _2$
• B. $2 NO _2+ H _2 O \rightarrow HNO _3+ HNO _2$
• C. $MnO _4^{-}+4 H ^{+}+3 e ^{-} \rightarrow MnO _2+2 H _2 O$
• D. $3 MnO _4^{2-}+4 H ^{+} \rightarrow 2 MnO _4^{-}+ MnO _2+2 H _2 O$

Answer 1

Answer: (C)

$MnO _4^{-}+4 H ^{+}+3 e ^{-} \rightarrow MnO _2+2 H _2 O$

Answer 2

So, the correct option is (C): $MnO _4^{-}+4 H ^{+}+3 e ^{-} \rightarrow MnO _2+2 H _2 O$