Extraction of chlorine from brine solution is based on

The platinum electrodes were immersed in a solution of cupric sulphate and electric current was passed through the solution. After some time,it was found that the colour of copper sulphate disappeared with the evolution of gas at the electrode. The colourless solution contains:

If an electric current is passed through an electrolyte solution,what happens to the ions?

Which one of the following metals cannot be obtained on electrolysis of aqueous solution of its salts?

The electrolytic decomposition of dilute sulphuric acid with $Pt$ electrodes in the cathodic reaction is:

The product obtained at the anode when $50 \%$ $H_2SO_4$ aqueous solution is electrolysed using platinum electrodes is: