A white substance having a strong smell of chlorine is used to clean water in water storage tanks. Identify the substance. Give its chemical name and write the chemical reaction for its preparation.

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Solution

Substance used to clean water in water storage tanks- Bleaching Powder.
Chemical Name- Carbon oxychloride.
Chemical formula- ${CaOCl}_{2} .$
Preparation of Bleaching Powder: Passing Chlorine ( ${Cl}_{2}$ ) gas over dry slaked lime (Calcium hydroxide, $Ca {(OH)}_{2}$ ) produces Bleaching Powder.
Reaction can be written as:
$Ca {(OH)}_{2} (s) + {Cl}_{2} (g) \to {CaOCl}_{2} (s) + H_{2} O (l) Calcium Chlorine Bleaching Water hydroxide Powder$

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