Question

A solution of a substance ‘X’ is used for whitewashing.

1. Name the substance ‘X’ and write its formula.
2. Write the reaction of the substance ‘X’ named in the above formula with water.

Answer 1

1. The substance ‘X” is calcium oxide (also called quick lime). Its formula is CaO.
2. \[\ce{\underset{(X)}{CaO_{(s)}} + H2O_{(l)} -> \underset{Calcium hydroxide}{Ca(OH)2_{(aq)}}}\]