JEE Main 16 March 2021 Shift 2 Solved Paper

Reduction of alumina (Al2O3) to Al cannot be achieved by carbon reduction. As aluminium has greater reactivity with oxygen than carbon and hence cannot be reduced by carbon. So, electrometallurgy (Hall-Heroult process) is used to get Al.
2Al2O3(I)+3C⟶4Al+3CO2
Rest oxides can be reduced by coke as follows
Fe2O3+3C⟶2Fe+3CO
Cu2O+C⟶2Cu+CO
ZnO+C

‌ Coke, ‌1673K

────────▶

Zn+CO