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 :
The hardness of water is due to the presence of salts of alkaline earth metals. Temporary hardness of water is due to presence of calcium and magnesium bicarbonates while permanent hardness is due to calcium and magnesium sulphates and. chlorides. Therefore, water is made hard by saturated with\[CaS{{O}_{4}}\].
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