A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.

CaOCl2

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CaSO4

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CaO

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CaCO3

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Solution

The correct option is C

CaO

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

Calcium oxide is an alkaline earth flux with the chemical formula CaO.

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