Nowadays,how can the quantity of electricity $Q$ be measured in an electrolytic cell?

Predict the products of electrolysis in each of the following:
$i$. An aqueous solution of $AgNO_3$ with silver electrodes
$ii$. An aqueous solution of $AgNO_3$ with platinum electrodes
$iii$. $A$ dilute solution of $H_2SO_4$ with platinum electrodes
$iv$. An aqueous solution of $CuCl_2$ with platinum electrodes.

Coulomb is equal to

Which gas is produced at the cathode when $NaOH$ is prepared by the chlor-alkali process?

How many minutes are required to deliver $3.21 \times 10^6$ Coulombs using a current of $500 \ A$ used in the commercial production of chlorine?

Identify True $(T)$ or False $(F)$ for the following statements :
$(i)$ In electrolytes,current flows due to electron displacement.
$(ii)$ When current flows from metal,the composition of the metal changes.
$(iii)$ Due to the passage of $DC$ current through the electrolytic solution,a reaction occurs.