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Question
The name of the salt used to remove permanent hardness of water is ______.
Options
Sodium hydrogen carbonate (NaHCO3)
Sodium chloride (NaCl)
Sodium carbonate decahydrate (Na2CO3.10H2O)
Calcium sulphate hemihydrate (CaSO4.`1/2`H2O)
Solution
The name of the salt used to remove permanent hardness of water is Sodium carbonate decahydrate (Na2CO3.10H2O).
Explanation:
Insoluble carbonates are created when washing soda reacts with the salts in water and are easily removed through physical means.
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