JEE Main 18 March 2021 Shift 1 Solved Paper

In the extraction of aluminium by electrolytic process, cryolite is added to reduce the melting point of the mixture. The use of cryolite reduces some of the energy cost involved in extracting aluminium.
Reactions involved in the electrolysis are given below
Al2O3⇌2Al+3+3O−2
Na3AlF6⇌3Na++Al+3+6F
CaF2⇌Ca+2+2F
At cathode
Al3++3e−⟶Al (reduction)
At anode
C+O2−⟶CO+2e−(oxidation)
C+2O2−⟶CO2+4e−