Name the following:
(a) A gas other than oxygen obtained at the anode during electrolytic reduction of fused alumina (Al2O3).
(b) An alkaline earth metal in period 3 of the periodic table.
(c) The chemical name of the main ore of zinc.
(a) Carbon dioxide (CO2)
(b) Magnesium (Mg)
(c) Zinc sulphide (ZnS)
