For a spontaneous process,what are the values of $\Delta G$,equilibrium constant $(K)$,and $E^o_{cell}$?

Some statements about Leclanché cell are:
$(I)$ Anode is zinc metal
$(II)$ Cathode is graphite rod surrounded by powdered $MnO_2$ and carbon
$(III)$ Electrolyte is a moist paste of $ZnO$ and $KOH$
$(IV)$ Oxidation product is $ZnO$
The correct statements are:

The reference electrode,specifically the Saturated Calomel Electrode $(SCE)$,is made from which of the following substances?

Which substance is used as an oxidising agent in a nickel-cadmium cell?

In a typical fuel cell,the reactant $(R)$ and product $(P)$ are

Depict the galvanic cell in which the cell reaction is: $Cu + 2Ag^{+} \to 2Ag + Cu^{2+}$