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.
The substance used for whitewashing is calcium oxide (CaO), also known as quicklime. The chemical reaction of calcium oxide with water is: CaO(s) + H₂O(l) → Ca(OH)₂(aq) + heat. This reaction produces calcium hydroxide, which is slaked lime, and releases heat.
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