Which of the following methods is/are used to remove permanent hardness of water?

Calgon's method

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Ion exchange method

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Synthetic resin method

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Clark's method

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Solution

The correct option is C Synthetic resin method
Calgon's method, ion exchange method and synthetic resin method are used to treat permanent hardness of water while Clark's method is used to treat temporary hardness of water.

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One of the following used for removing permanent hardness of water

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