A white substance having a strong smell of chlorine and used for cleaning water storage tanks is known as ______.

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Solution

Substance used for cleaning water storage tanks and sterilizing drinking water: Calcium oxychloride, also called bleaching powder.
Chemical formula: ${CaOCl}_{2}$
Colour: white
Smell: strong smell of chlorine
Hence, a white substance having a strong smell of chlorine and used for cleaning water storage tanks is known as bleaching powder.

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