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Permanent hardness can be removed by add...

Permanent hardness can be removed by adding

A

`Cl_(2)`

B

`Na_(2)CO_(3)`

C

`Ca(O Cl)Cl`

D

K.

Text Solution

Verified by Experts

The correct Answer is:
B
Permanent hardness is removed by precipitating carbonates of `Ca^(+2)` and `Mg^(+2)`
`CaCl_(2)+Na_(2)CO_(3)toCaCO_(3)darr+2NaCl`
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