JEE Main 2015 · 4 Apr · Shift 1, Chemistry question 42

The electrolyte is alumina dissolved in molten cryolite. $\ce{Na3AlF6}$ (with $\ce{CaF2}$) is added to lower the melting point and improve conductivity; it is the solvent, not the electrolyte that is decomposed. So statement (4) is the false one.

The others are true:

• the carbon anodes are oxidised to CO and $\ce{CO2}$;
• $\ce{Al^3+}$ is reduced at the cathode.