1.

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.

Answer»

(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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