Redox Reactions And Electrochemistry Ques 17

Question: Which of the following reactions occurs at the cathode of a common dry cell [NCERT 1978]

Options:

A) $ Mn,\to ,M{n^{2+}}+2{e^{-}} $

B) $ 2MnO_2+Z{n^{2+}}+2{e^{-}},\to ZnMn_2O_4 $

C) $ 2ZnO_2+M{n^{2+}}+2{e^{-}},\to MnZn_2O_4 $

D) $ Zn,\to ,Z{n^{2+}}+2{e^{-}} $

Show Answer

Answer:

Correct Answer: B

Solution:

In common dry cell. Anode : $ Zn\to Z{n^{++}}+2{e^{-}} $ Cathode: $ 2MnO_2+Z{n^{++}}+2{e^{-}}\to ZnMn_2O_4 $ .



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