Permanent hardness of water cannot be removed by which one of the following methods ........

General Science (NDA) Chemistry

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Permanent hardness of water cannot be removed by which one of the following methods?

Treatment with washing soda

Calgon’s method

Boiling

Ion exchange method

Explanation:

The per maiient hardness of water is due to presence of chloride and sulphates salts of calcium and magnesium. This type of hardness can be removed by Calgon's method, Ion-exchange method and treatment with washing soda. Boiling can remove only the temporary hardness of water but not the permanent hardness.