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Lime-soda process is used to remove (fro...

Lime-soda process is used to remove (from water)

A

odour and taste

B

iron and maganese

C

permanent hardness

D

temporary hardness

Text Solution

Verified by Experts

The correct Answer is:
D
Temporary hardness in water is dissolved bicarbonates of calcium and magnesium. When lime is added, they are precipited as carbonates.
`Ca(OH)_(2)+Ca(HCO_3)_(2) rarr 2CaCO_(3)+2H_(2)O`
Temporary hardness is measured in terms of ppm of `CaCO_(3)`.
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