A) Saturation of water with \[CaC{{O}_{3}}\]
B) Saturation of water with \[MgC{{O}_{3}}\]
C) Saturation of water with \[CaS{{O}_{4}}\]
D) Addition of \[N{{a}_{2}}S{{O}_{4}}\] to water
Correct Answer: C
Solution :
Alkaline earth metal salts cause hardness. Temporary hardness caused by soluble Ca and Mg hydrogen carbonates. Calcium and magnesium soluble sulphates and chlorides cause permanent hardness. ______________
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