Question

Solution substance (x) is used in white washing first name the substance X and write its formula second write the reaction of substance X named in equation above with water

Answer 1

Substance 'X' is Plaster of Paris (POP).
Formula is : CaSO4.1/2H2O
Reaction involved, CaSO4.1/2H2O + 3/2 H2O ----> CaSO4.2H2O
(POP) (Gypsum)

Answer 2

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)