Question

A solution of substance X' is used for whitewashing.
(a) Name the substance 'X' and write its formula.
(b) Write the reaction of the substance 'X' named with water.
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Answer 1

Answer:

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(a) Calcium Oxide

(B) CaO+H2O ----> Ca(OH) 2

Answer 2

(i) Substance X is Calcium Oxide whose solution we use in water which is used for white washing.

The formula of substance X is CaO.

(ii) Calcium oxide reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.

CaO ( s ) + H2O ( l ) → Ca(OH2) ( aq )