A) ppm by weight of \[MgS{{O}_{4}}\]
B) g/L of \[CaC{{O}_{3}}\]and \[MgS{{O}_{3}}\] present
C) ppm by weight of \[CaC{{O}_{3}}\] irrespective of whether it is actually present
D) ppm of \[CaC{{O}_{3}}\] actually present in water
Correct Answer: C
Solution :
Degree of hardness of water is measured in terms of ppm by weight of \[CaC{{O}_{3}}\] irrespective of whether it is actually present or not.
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