Which reaction occurs at the cathode during electrolysis of an aqueous solution of KCl?

Which gas is evolved at the cathode during the electrolysis of an aqueous solution.

Electrolysis of dilute aqueous solution of KCl gives?

Which gas is evolved at cathode dring the electrolysis of an aqueous solution of NaCl?

Which reaction occurs at cathode during electrolysis of fused lead bromide :

Which of the following reactions would take place at the cathode during the electrolysis of an aqueous solution of sodium chloride?

The reaction at cathode during the electrolysis of aqueous solution of NaCI in Nelson cell is :