Rajasthan Police Constable Model Paper 8

Question : 71 of 150

Marks: +1, -0

Calcium oxide reacts vigorously with water to produce ______________.

Solution:

Calcium oxide reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.
CaO(s) (Quick lime) + $H_2O(l) --> Ca(OH)_2$
(aq) (Slaked lime) + Heat
In this reaction, calcium oxide and water combine to form a single product, calcium hydroxide.
Such a reaction in which a single product is formed from two or more reactants is known as a combination reaction.
A solution of slaked lime produced by the above reaction is used for whitewashing walls.
Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate ( $CaCO_3$ )on the walls.
Calcium carbonate is formed after two to three days of whitewashing and gives a shiny finish to the walls.

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