Question

A solution of a substance 'X' is used for white washing.
1. Name the substance 'X' and write its formula.
2. Write the reaction of the substance 'X' named in (i) above with water.[2 MARKS]

Answer 1

Each point: 1 Mark

1. The substance 'X' is calcium oxide (quick lime). Its formula is $\text{CaO}$.

2. $\text{CaO(s)}+{\text{H}}_2\text{O(l)}\to {\text{Ca(OH)}}_2\text{(aq)}$