Write the chemical formulae of the following.
(a) Hydrogen sulphide
(b) Aluminium oxide
(c) Sodium nitrate
(d) Calcium hydroxide
Write the balanced chemical equations for the following reactions. (A) Calcium hydroxide + Carbon dioxide → Calcium carbonate + water (B) Zinc + Silver nitrate → Zinc nitrate + Silver (C) Aluminium + copper chloride → Aluminium chloride + Copper (D) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride.