Which of the following is NOT a use of bleaching powder?
Removing hardness of water
Bleaching powder is calcium oxychloride, Ca(OCl)Cl. It releases chlorine when it reacts with dilute acids or with carbon dioxide in air, and this chlorine acts as a bleaching and disinfecting agent.
Because of this, bleaching powder is used for bleaching cotton and linen in the textile industry, for disinfecting drinking water in municipal supplies, and as a starting material in the manufacture of chloroform (CHCl3). It has no role in removing the hardness of water: hardness caused by calcium and magnesium salts is removed by boiling, by adding washing soda, or by ion-exchange methods, not by bleaching powder.
Hence, the answer is Removing hardness of water.
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