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Which will produce hard water ?...

Which will produce hard water ?

A

Saturation of water with `CaCO_(3)`

B

Saturation of water with `MgCO_(3)`

C

Saturation of water with `CaSO_(4)`

D

Addition of `Na_(2)SO_(4)` to water

Text Solution

Verified by Experts

The correct Answer is:
C
Alkaline earth metal salts cause hardness. Temporary hardness is caused by soluble Ca and Mg hydrogen carbonates. Calcium and magnesium sulphates and chlorides cause permanent hardness.
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