Which metal is electro-deposited on iron surface to prevent rusting?

If the passage of current liberates $H_2$ at cathode and $Cl_2$ at anode then the solution is

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

During the electrolysis of aqueous sodium chloride,the product obtained at the anode is:

How will the $pH$ of brine (aq. $NaCl$ solution) be affected when it is electrolysed?

In which process does a chemical change occur when an electric current is passed through it?