A substance X when mixed with water is used for white washing. The substance X is also formed when a substance Y decomposes. Identify X and Y and write their chemical formula.

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Solution

The substance X is calcium oxide, commonly known as quicklime. Its chemical formula is CaO.
The substance Y is calcium carbonate. Its chemical formula is CaCO₃.

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A substance X when mixed with water is used for white washing. The substance X is also formed when a substance Y decomposes. Identify X and Y and write their chemical formula.

The substance X is calcium oxide, commonly known as quicklime. Its chemical formula is CaO.The substance Y is calcium carbonate. Its chemical formula is CaCO3.

The substance X is calcium oxide, commonly known as quicklime. Its chemical formula is CaO.
The substance Y is calcium carbonate. Its chemical formula is CaCO₃.