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प्रश्न
How the temporary and permanent hardness is removed?
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उत्तर
Temporary hardness can easily be removed by boiling. permanent hardness can be removed by the following methods:-
(i) By the addition of washing soda
(ii) By ion exchange method
(iii) By the use of polyphosphate water softener
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संबंधित प्रश्न
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