Which one of the following materials conducts electricity?

Two statements are given below.
Statement $I$ : Molten $NaCl$ is electrolysed using $Pt$ electrodes. $Cl_2$ is liberated at anode.
Statement $II$ : Aqueous $CuSO_4$ is electrolysed using $Pt$ electrodes. $O_2$ is liberated at cathode.
The correct answer is

Electrolysis of which of the following yields benzene?

During the electrolysis of water,the volume of $O_2$ gas evolved is $2.24 \ dm^3$. Under the same conditions,what will be the volume of $H_2$ gas in $dm^3$?

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

If an aqueous solution of $NaF$ is electrolysed between inert electrodes,the product obtained at anode is