Write the balanced chemical equation for the following and identify

• Write the balanced chemical equation for the following and identify the type of reaction in each case.
  • Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s)
  • Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)
  • Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)
  • Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g)
  Answer:
  (a) 2KBr (aq) + BaI2 (aq) ⇨ 2KI (aq) + BaBr2 (s)
  It is a double displacement reaction.
  (b) ZnCO3 (s) ⇨ ZnO (s) + CO2 (g)
  It is a decomposition reaction.
  (c) H2 (g) + Cl2 (g) ⇨ 2HCl
  It is a combination reaction.
  (d) Mg (s) + 2HCl (aq) ⇨ MgCl2 (aq) + H2 (g)
  It is a displacement reaction.