Assertion:Temporary hardness can be removed by the addition of lime
`Ca(HCO_(3))_(2)` in hard water is converted to insoluble `CaCO_(3)` on moderate heating.

Explanation

(b) Correct explanation. Lime reacts with `Ca(HCO_(3))_(2)` to from insouble `CaCO_(3)`.
`Ca(OH_(3)_(2)+CaO to 2CaCO_(3)+H_(2)O`