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

Treatment with sodium carbonate

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Calgon's method

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Clark's method

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Ion-exchange method

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Solution

The correct option is C Clark's method
Temporary hardness of water is removed by Clark's method and boiling. While permanent hardness of water is removed by treatment with sodium carbonate $(N a_{2} C O_{3})$ , Calgon's method and ion-exchange method.

Hence, option (c) is correct.

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