Question

A solution of a substance âx' is used for white washing. (i) name the substance âx' and write its formula. Write the reaction of the substance âx' named in (i) above with water.

Answer 1

Answer:

ax is calcium oxide

formula CaO

calcium oxide react vigorously with water to produce salked lime (Calcium Hydroxide(Ca(OH)2) and released large amount of heat.

Reaction:

CaO(s) +H2O(l) - Ca(OH)2 (aq).

Answer 2

Answer:

Ans. i. The substance whose solution is water is used for white washing is calcium oxide. Its formula is CaO.

ii. CaO(s) + H2O(l) Ca(OH)2(aq)