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Byju's Answer
Standard IX
Chemistry
Hardness of Water:Causes, Types and Treatments
Permanent har...
Question

Permanent hardness of water is due to

A
bicarbonate ion
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B
sulphate ion
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C
nitrate ion
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D
phosphate ion
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Solution

The correct option is A sulphate ion
Permanent hardness of water is due to sulphate ion and chloride ion and cannot be easily removed. It can be removed by treating with washing soda.

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