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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

g/L of `CaCO_3` and `MgCO_3` present

B

ppm by weight of `MgSO_4`

C

ppm of `CaCO_3` actually present in water

D

ppm by weight of `CaCO_3` irrespective of whether it is actually present

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The correct Answer is:
D
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