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The temporary hardness of water due to calcium bicarbonate can be removed by adding

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The temporary hardness of water due to calcium bicarbonate can be removed by adding
A. `Ca(OH)_(2)`
B. `CaCO_(3)`
C. `CaSO_(4)`
D. `Na_(2)SO_(4)`
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Correct Answer - A
`Ca(OH)_(2)` reacts with `Ca(HCO_(3))_(2)` to precipitate `CaCOI_(3)`
`Ca(HCO)_(2)+Ca(OH)_(2)rarr 2 CaCO_(3)darr+2H_(2)O`
`Mg(HCO_(3))_(2)+2Ca(OH)_(2)rarr 2 CaCO_(3)darrMg(oH)_(2)darr+2H_(2)O`
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