Of the following,which cannot be obtained by electrolysis of the aqueous solution of their salts?

Electrolysis of a dilute aqueous $NaCl$ solution is carried out by passing a current of $10 \, mA$. How much time will it take to liberate $0.01 \, mol$ of $H_2$ gas at the cathode? $(1 \, F = 96500 \, C \, mol^{-1})$

Which of the following elements is obtained industrially by the electrolysis of an aqueous solution of its compound?

When an electric current is passed through a cell containing an electrolyte,positive ions move towards the cathode and negative ions move towards the anode. If the cathode is removed from the solution,what will happen?

When sodium chloride solution is electrolysed,the gas that is liberated at the cathode is

Nowadays,how can the quantity of electricity $Q$ be measured in an electrolytic cell?