A white powdery substance having a 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

The compound is Calcium Oxychloride, in common called Bleaching powder. Chlorine gas on reacting with dry slaked lime $[C a (O H)_{2}]$ produces bleaching powder $(C a O C l_{2})$ . The chemical equation involved in the reaction can be represented as:

$C a (O H)_{2} + C l_{2} ⟶ C a O C l_{2} + H_{2} O$

Uses-

1)Bleaching powder is used for disinfecting water to make it germ-free.

2) It is used in the textile industry to produce cotton and linen materials.

3) It is also used as an oxidizing agent in many chemical industries.

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