Question

A solution of a subtance X is used for white washing.(1) name the subtances X and write it's formula. (2) write the reaction of the subtances X named in (1) above with water

Answer 1

1. The substance X is calcium oxide. Its chemical formula is CaO.
2. Calcium oxide reacts vigorously with water to form calcium hydroxide (slaked lime)

CaO (s) +. H2O (l) → Ca(OH)2. (aq)(quick lime/. (water). (calcium hydroxide/calcium oxide) slaked lime)