Question

What happens when:-

(i) Mg is burnt in air 

(ii) Quick lime is heated with silica 

(iii) Chlorine is heated with slaked lime

Answer 1

(i) Mg burns with dazzling brilliance in air to form magnesium oxide.

2Mg + O₂ \(\overset{\Delta}{\rightarrow}\) 2MgO

(ii) Quick lime is heated with silica to form calcium silicate.

CaO + SiO₂ → CaSiO₃

(iii) Chlorine is heated with slaked lime to form calcium hypochlorite, a constituent of bleaching powder.

2Ca(OH)₂ + 2Cl₂ → CaCl₂ + Ca(OCl)₂ + 2H₂O

Bleaching powder