A sanitary worker uses a white substance having a strong smell of chlorine to clear a water tank. Identify the substance and write the chemical equation for its preparation.

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Solution

Bleaching powder is a chemical compound with the chemical name, Calcium oxychloride $({CaOCl}_{2})$ . It is a white substance having a strong smell of chlorine. It is prepared by the reaction of Slaked lime with Chlorine.
The chemical equation for its preparation is given below.
$Ca {(OH)}_{2} (s) + {Cl}_{2} (g) \to {CaOCl}_{2} (s) + H_{2} O (l) (Slaked lime) (Chlorine) (Bleaching powder) (Water)$
Thus, the chemical substance used to clean the water tank is Calcium oxychloride (bleaching powder).

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