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Question

Permanent hardness of water can be removed by :

A
boiling
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B
filtration
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C
adding washing soda
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D
both b and c
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Solution

The correct option is C adding washing soda
Hardness of water can be of two types temporary and permanent hardness. Permanent hard water contains chlorides and sulphates of calcium and magnesium. It can be removed by adding washing soda.

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