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(C) Temporary hardness of water is caused by the presence of magnesium and calcium bicarbonates, which can be removed by Clark's method (adding lime)

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Clark's method

Vedclass · Answer

(C) Temporary hardness of water is caused by the presence of magnesium and calcium bicarbonates, which can be removed by Clark's method (adding lime) or boiling.Permanent hardness of water is caused by the presence of chlorides and sulfates of magnesium and calcium.Methods used for the removal of permanent hardness include treatment with sodium carbonate $(Na_{2}CO_{3})$, Calgon's method, and the ion-exchange method.Therefore, Clark's method is not suitable for the removal of permanent hardness.

The one that is $NOT$ suitable for the removal of permanent hardness of water is :

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