Write their valencies and chemical formula of the following compounds.
a) Zinc carbonate c) Ammonium sulphide
b) Barium chloride d) Sodium nitrate
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.