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A white-coloured salt is used to treat the water in water storage tanks. Identify the salt. Give its chemical name.

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Bleaching powder / Calcium oxychloride.

Bleaching powder / Calcium hydroxide

Washing soda/ Sodium carbonate decahydrate

Washing soda/ Sodium hydrogen carbonate

answer is A.

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Detailed Solution

The salt used to treat water in water tanks is Bleaching Powder. Its Chemical Name is Calcium oxychloride and its Chemical formula is ${CaOCl}_{2}$ _.

Preparation of Bleaching Powder: Passing Chlorine gas over Dry slaked lime produces Bleaching Powder. The reaction for the same is given below :

$Ca {(OH)}_{2} + {Cl}_{2} \to {CaOCl}_{2} + H_{2} O$

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