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Question
When dry cell is in use the change taking place at cathode is ______.
Options
`"Zn"_(("aq".))^(++)` is reduced
`"NH"_(4("aq".))^(+)` ions are reduced
MnO2 is oxidized
Zn is oxidized
MCQ
Fill in the Blanks
Solution
When dry cell is in use the change taking place at cathode is Zn is oxidized.
Explanation:
In dry cell
Anode : \[\ce{Zn -> Zn^{2+} + 2e^-}\]
Cathode : \[\ce{2MnO2 + 2NH^+_{4(aq.)} + 2e^- -> Mn2O3 + 2NH3 + H2O}\]
MnO2 is reduced.
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