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A solution of a substance 'X' is used for whitewashing.
(i) Name the substance 'X' and write its formula.
(ii) Write the reaction of the substance 'X' named in (i) above with water.

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(i) The substance 'X' used for whitewashing is quick lime (calcium oxide). Its formula is CaO.

(ii) When quick lime is mixed with water, the following reaction takes place:
              CaO(s) + H2O(l) ------> Ca(OH)2(aq) + Heat
(
Quick lime calcium oxide)    water    calcium hydroxide(slaked lime)

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