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(i) Solid calcium oxide was taken in a c...

(i) Solid calcium oxide was taken in a container and water was added slowly to it :
(a) Write the observation .
(b) Write the chemical formula of the product formed
(ii) What happens when carbon dioxide gas is bubbled through lime water :
(a) In small amount ,
(b) In excess?
(iii) Why do you apply paint on iron articles ?

Text Solution

Verified by Experts

(i) (a) Calcium oxide a large reacts vigorously with water and releases a large amount of heat .
(b) Calcium hydrooxide (Slaked lime ) i.e., `Ca(OH)_(2)` is formed .
(iii) (a) In small amount, solution becomes milky due to the formation of calcium carbonate .
`Ca(OH)_(2)+CO_(2)rarrCACO_(3)+H_(2)O`.

(b) In excess, milkiness disappears because calcium carbonate changes to calcium hydrogen carbonate which is colourless in nature.
`CaCO_(3)+H_(2)O+CO_(2)rarr underset("Colourless") (Ca(HCO_(3))_(2))`
(iii) Paint forms a projective coating on the surface of iron , so that oxygen and moisture present in the air cannot have a direct contact with iron .
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