A white powdery substance having strong smell of chlorine is used for disinfecting drinking water supply at waterworks. Identify the substance. Give its chemical name and write the chemical reaction for its preparation.

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Solution

Bleaching powder is a white powder that emits a strong smell of chlorine and is used for disinfecting drinking water supply at waterworks.
The chemical name of bleaching powder is calcium oxychloride (CaOCl₂).

The chemical reaction that takes place in its preparation is as follows.
Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

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