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Piyush365
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Asked: 2025-09-30T04:14:18+00:00 In:

The name of the salt used to remove permanent hardness of water is:

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0%[A] Sodium hydrogen carbonate
0%[B] Sodium chloride
100%[C] Sodium carbonate decahydrate ( 1 voter )
0%[D] Calcium sulphate hemihydrate
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The correct option is [C]. Sodium carbonate decahydrate (Na₂CO₃·10H₂O), also called washing soda, is used to remove permanent hardness of water. It reacts with calcium and magnesium salts, forming insoluble carbonates, softening the water effectively.

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    1 Answer

    1. ANSWER: [C]

      Explanation: Sodium carbonate decahydrate (Washing soda: )  is used to remove the permanent hardness of water. Sodium carbonate decahydrate, also called washing soda, is used to remove permanent hardness of water.

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