A) Saturation of water with \[CaC{{O}_{3}}\]
B) Addition of \[N{{a}_{2}}S{{O}_{4}}\] to water
C) Saturation of water with \[MgC{{O}_{3}}\]
D) Saturation of water with \[CaS{{O}_{4}}\]
Correct Answer: D
Solution :
\[CaS{{O}_{4}}\] is partially soluble in water, So \[C{{a}^{+2}}\] produce hard water.
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