Write the balanced chemical equation for the following and identify the type of reaction in each case.
(a) Potassium bromide(aq) + Barium iodide(aq) `rarr` Potassium iodide(aq) + Barium bromide(s)
(b) Zinc carbonate(s) `rarr` Zinc oxide(s) + Carbon dioxide(g)
(c) Magnesium(s) + Hydrochloric acid(aq) `rarr` Magnesium chloride(aq) + Hydrogen(g)

Explanation

(a) `2KBr(aq)+BaI_(2)(aq)rarr2KI(aq)+BaBr_(2)(s)`, Double displacement reaction
(b) `ZnCO_(3)(s)rarrZnO(s)+CO_(2)(g)`, Decomposition reaction
(c ) `H_(2)(g)+Cl_(2)(g)rarr2HCl(g)`, Combination reaction
(d) `Mg(s)+2HCl(aq)rarrMgCl_(2)(aq)+H_(2)(g)`, Displacement reaction