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UPSC CAPF Assistant Commandant 2020 Paper
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© examsnet.com
Question : 11
Total: 125
Which one of the following methods can be used to remove permanent hardness of water?
Boiling
lon exchange
Lime treatment
Bubbling sulphur dioxide gas
Validate
Solution:
Ion Exchange Resin Method, the permanent hardness of water is removed by using resins.
Ca
2
+
/
Mg
2
+
ions are exchanged with chloride and sulphate ions are exchanged with anion exchange using solid polymeric ion exchange resin.
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