Temporary hardness of water can be removed by adding:

N a O H

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N a_{2} C O_{3}

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C a (O H)_{2}

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M g C l_{2}

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Solution

The correct option is D $C a (O H)_{2}$
Temporary hardness of water can be removed using Clark's method by adding $C a (O H)_{2}$ . In Clark's process, slaked lime $C a (O H)_{2}$ is added to temporary hard water. Insoluble calcium carbonate precipitates out and thus, temporary hardness is removed.

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Temporary hardness may be removed from water by adding

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