Which metal cannot be obtained from the electrolysis of its aqueous salt solution?

Products of electrolysis depend upon which factors? Justify with suitable examples.

$O_2$ gas will be evolved as a product of electrolysis of $:$
$(A)$ an aqueous solution of $AgNO_3$ using silver electrodes.
$(B)$ an aqueous solution of $AgNO_3$ using platinum electrodes.
$(C)$ a dilute solution of $H_2 SO_4$ using platinum electrodes.
$(D)$ a high concentration solution of $H_2 SO_4$ using platinum electrodes.
Choose the correct answer from the options given below $:$

If $6.5 \ g$ of $Mg$ is deposited during the electrolysis of fused $MgCl_2$,what will be the volume of chlorine gas (in $L$) discharged at the electrode at $STP$?

When $1 \ A$ of current flows for $1 \ s$ through a conductor,this quantity of electricity is known as

Electrolysis is a process in which the cations and anions of an electrolyte .....