Temporary hardness of water can be removed:

Options

A. by passing `CO_(2)`
B. by passing `SO_(2)`
C. by adding `Ca(OH)_(2)`
D. by adding NaCl

Answer

C

Explanation

Temporary hardness of water can be removed by Clark.s process. In this process, water is treated with a calculated quantity of lime.
`Ca(HCO_(3))_(2) + Ca(OH)_(2) to 2CaCO_(3) darr + 2H_(2)O`
`Mg(HCO_(3))_(2) + Ca(OH)_(2) to CaCO_(3) darr MgCO_(3) darr + 2H_(2)O`