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Which of the following operations would cause removal of temporary hardness of water ?
A. Passing `CO_(2)` through is
B. Passing `SO_(2)` through is
C. adding calculated amount of `Ca(OH)_(2)`
D. adding calculated amount of sodium hypophosphate.

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Correct Answer - C
`Ca(OH)_(2)` removes soluble bicarbonates in the form of unsoluble `CaCO_(3)`.

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