Question

Which of the following reactions occurs at the cathode of a common dry cell.

• A. $H_{2}SO_{4}$
• B. $Pb_{3}O_{4}$
• C. $PbO_{2}$
• D. $H_{2}SO_{4}$

Answer 1

Answer: (B)

$Pb_{3}O_{4}$

Answer 2

In common dry cell.

Anode : $Zn \rightarrow Zn^{+ +} + 2e^{-}$

Cathode $2MnO_{2} + Zn^{+ +} + 2e^{-} \rightarrow ZnMn_{2}O_{4}$.