Question

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

Answer 1

$\huge\mathbb\pink{Question:-}$

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

$\huge\mathbb\blue{Answer:-}$

The substance ‘X’ which is used in whitewashing is quick lime or Calcium Oxide and its formula is CaO.

CaO + H2O → Ca(OH)2

Answer 2

(i) Substance X is Calcium Oxide whose solution we use in water which is used for white washing. The formula of substance X is Cao.

(ii) Calcium oxide reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.

Ca0(s) + H2O(l) → Ca(OH)2(aq)

(Quick Lime) (Water) (Slaked Lime)