Question

A substance 'X' is used in white washing and is obtained by heating limestone in the absence of air. Identify 'X:

Answer 1

Answer:

The chemical substance X used for whitewashing is Calcium oxide also known as quicklime or burnt lime or lime.

it is also obtained by heating limestone in the absence of air ......

CaCO3-----> CaO + CO2

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Answer 2

X is CaO.

• The substance which is used in whitewash is calcium oxide which is also called quick lime or slaked lime.
• Calcium oxide is obtained by heating limestone or calcium carbonate in the absence of air.
• The reaction is-
• $CaCO_3\rightarrow CaO+CO_2$
• In this reaction, one mole of calcium carbonate reacts to form one mole of calcium oxide along with carbon dioxide gas.
• Hence X is CaO.