During electrolysis of water,the volume of $O_2$ liberated is $2.24 \ dm^3$. The volume of hydrogen liberated,under same conditions,will be .............. $dm^3$.

Which of the following is produced by the electrolysis of molten $NaCl$?

In electrolysis of aqueous $NaOH$ at $NTP$,$2.8 \ L$ of oxygen gas is liberated at the anode. The amount of gas liberated at the cathode will be ............ $L$.

During the electrolysis of cryolite,aluminium and fluorine are formed in $........$ molar ratio :

The aqueous solution of which of the following decomposes on passing electric current?

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