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The hardness of water sample ( in term ...

The hardness of water sample ( in term of equivalengt of `CaCO_(3)` ) containing `10^(-3)`M `CaSO_(4)` is `:`
( Molar mass of `CaSO_(4) = 136 g//`mol )

A

100 ppm

B

50 ppm

C

10 ppm

D

90 ppm

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