MCQ
The reaction at cathode in the cells commonly used in clocks involves.
- ✓reduction of $\mathrm{Mn}$ from $+4 to +3$
- Boxidation of $\mathrm{Mn}$ from $+3 to +4$
- Creduction of $\mathrm{Mn}$ from $+7 to +2$
- Doxidation of $\mathrm{Mn}$ from $+2 to +7$