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.

(i) The substance ‘X’ which is used in whitewashing is quick lime or Calcium Oxide (CaO).

(ii) CaO + H₂O → Ca(OH)₂