A) \[Mn\,\to \,M{{n}^{2+}}+2{{e}^{-}}\]
B) \[2Mn{{O}_{2}}+Z{{n}^{2+}}+2{{e}^{-}}\,\to \,\,ZnM{{n}_{2}}{{O}_{4}}\]
C) \[2Zn{{O}_{2}}+M{{n}^{2+}}+2{{e}^{-}}\,\to \,\,MnZ{{n}_{2}}{{O}_{4}}\]
D) \[Zn\,\to \,Z{{n}^{2+}}+2{{e}^{-}}\]
Correct Answer: B
Solution :
In common dry cell. Anode : \[Zn\to Z{{n}^{++}}+2{{e}^{-}}\] Cathode: \[2Mn{{O}_{2}}+Z{{n}^{++}}+2{{e}^{-}}\to ZnM{{n}_{2}}{{O}_{4}}\].
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