Temporary hardness of water can be removed by :

boiling

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saponification

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clark's method

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chlorination

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Solution

The correct options are
A boiling
C clark's method
The temporary hardness of water can be removed by boiling. $C a (H C O_{3})_{2} b o i l - - \to C a C O_{3} ↓ + C O_{2} ↑ + H_{2} O$ .
Clark's method which uses lime (calcium hydroxide), it is also used for removal of temporary hardness of water.
$C a (H C O_{3})_{2} + C a (O H)_{2} \to 2 C a C O_{3} + 2 H_{2} O$ .

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