Which compound acts as an oxidising agent in a dry cell?

Which of the following statements is correct regarding the cathode of an electrochemical cell?

Which of the following statements is correct regarding the cathode of an electrochemical cell?

Which of the following substances is used in a dry cell?

The zinc/silver oxide cell is used in electric watches. The reaction is as follows:
$Zn(s) + Ag_2O(s) + H_2O(l) \rightarrow Zn^{2+}(aq) + 2Ag(s) + 2OH^-(aq)$
Given:
$Zn^{2+} + 2e^- \rightarrow Zn ; E^{\circ} = -0.760 \, V$
$Ag_2O + H_2O + 2e^- \rightarrow 2Ag + 2OH^- ; E^{\circ} = 0.344 \, V$
If $F = 96,500 \, C \, mol^{-1}$,the $\Delta G^{\circ}$ of the cell will be $....$ (in $kJ \, mol^{-1}$)

Which one of the following is the correct plot of $\Lambda_m$ (in $S \ cm^2 \ mol^{-1}$) and $\sqrt{C}$ (in $mol^{1/2} \ L^{-1/2}$) for a $KCl$ solution? ($y=\Lambda_m$; $x=\sqrt{C}$)