A solution of the substance 'X' is used for white washing.
(i) Name the substance 'X' and write its formula.
(ii) Write the reaction of the substance 'X' with water.

Explanation

(i) The substance 'X' is calcium oxide. Its chemical formula is CaO
(ii) Calcium oxide reacts vigorously with water to form calcium hydroxide (slaked lime)
`CaO (s) +H_(2)O(l) rarr Ca(OH)_(2)(aq)`
Calcium oxide (Quick Lime) + Water `rarr` Calcium Hydoxide (Slaked Lime).