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Question

Temporary hardness of water can be removed by Clark's Method using:

A
NaCl
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B
NaOH
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C
Na2CO3
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D
Ca(OH)2
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Solution

The correct option is D Ca(OH)2
Temporary hardness is due to the presence of bicarbonates of calcium and magnesium. Both these, when treated with Ca(OH)2, precipitate Ca2+ and Mg2+ as insoluble carbonates, which can then be filtered out. This is called Clark's method.

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