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Question

The reagent (s) that can be used for softening the temporary hardness of water is (are)

A
ion exchange resins
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B
Ca(OH)2
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C
Na6P6O18
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D
None of the above
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Solution

The correct option is B Ca(OH)2
Temporary hardness due to bicarbonates of calcium and magnesium. Temporary hardness can be removed by Clark's proces, which involves the addition of slaked lime, Ca(OH)2.
Ca(HCO3)+Ca(OH)22CaCO3+2H2O


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