A solution of substance X is used for white washing.

(i) Name the substance X and write its formula.

(ii) Write the reaction of the substance X named in (i) above with water.

(i) Substance X is calcium oxide which is used for white washing.

The formula of substance X is CaO.

(ii) Calcium oxide reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.