A solution of a substance 'X' is used for whitewashing

CBSE Class 10
1

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.
(iii) Write the balanced equation for the following chemical reaction:

Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride

2

(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 + H2O → Ca(OH)2
Calcium oxide Water Calcium hydroxide
(iii) 3BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3