Question

When dry cell is in use the change taking place at cathode is ______.

विकल्प

• `"Zn"_(("aq".))^(++)` is reduced

• `"NH"_(4("aq".))^(+)` ions are reduced

• MnO₂ is oxidized

• Zn is oxidized

Answer 1

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.