1.

The reagents used fro softening of the temporary hardness of water is/areA. `Ca_(3)(PO_(4))_(2)`B. `Ca(OH)_(2)`C. `Na_(2)CO_(3)`D. `NaOCl`

Answer» Correct Answer - B::C
`Ca(OH)_(2) and Na_(2)CO_(3)` react with bicarbonates of Ca and Mg present in temporary hard water to form the corresponding insoluble carbonates which upon filtration give soft water.
`Ca(HCO_(3))_(2) + Ca(OH)_(2) to 2CaCO_(3) darr + 2H_(2)O`
`Ca(HCO_(3))_(2) + Na_(2)CO_(3) to CaCO_(3) darr + 2NaHCO_(3)`


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