A) g/L of \[CaC{{O}_{3}}\]and\[MgC{{O}_{3}}\]present.
B) ppm by weight of\[MgS{{O}_{4}}.\]
C) ppm of\[CaC{{O}_{3}}\]actually present in water.
D) ppm by weight of\[CaC{{O}_{3}}\]irrespective of whether it is actually present.
Correct Answer: D
Solution :
The degree of hardness of water is usually expressed in terms of ppm by weight of \[CaC{{O}_{3}}\]irrespective of whether it is actually present. Hence, the correct option is [d].
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