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The degree of hardness of water is usual...

The degree of hardness of water is usually expressed in terms of

A

ppm by weight of `MgSO_(4)`

B

g/L of `CaCO_(3)` and `MgCO_(3)` present

C

ppm by weight of `CaCO_(3)` irrespective of whether it is actually present

D

ppm of `CaCO_(3)` actually present in water.

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The correct Answer is:
C
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