Chlorine can be manufactured from

During the electrolysis of cryolite,aluminium and fluorine are formed in $........$ molar ratio :

If $0.50 \ L$ of a $0.60 \ M$ $SnSO_4$ solution is electrolyzed for a period of $30.0 \ min$ using a current of $4.60 \ A$ with inert electrodes,what is the final concentration of $Sn^{2+}$ remaining in the solution? (Atomic weight of $Sn = 119$)

Assertion : $A$ small amount of acid or alkali is added before electrolysis of water.
Reason : Pure water is a weak electrolyte.

On the electrolysis of aqueous solution of sodium sulphate,at the cathode we get:

Molten sodium chloride conducts electricity due to the presence of