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 are causing 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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