One of the commonly used electrodes is the calomel electrode. Under which of the following categories does the calomel electrode fall?

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 of the following hot aqueous solutions is used to dip carbon rods of $H_2 - O_2$ fuel cell?

Which of the following reactions occurs at the cathode during the discharging of a lead accumulator?

Give the symbolic representation of the galvanic cell obtained by using the following standard reduction potentials at $298 \ K$ and calculate its standard cell potential $(E^o_{cell})$.
$(i)$ $E^o_{Ag^{+}|Ag} = 0.80 \ V$
$(ii)$ $E^o_{Zn^{2+}|Zn} = -0.76 \ V$

What is an electrode and a half-cell? Explain their symbolic representation with a suitable example.