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What is the degree of hardness of the sa...

What is the degree of hardness of the sample of water containing 24 mg of `MgSO_(4)` (molecular mass 120) per kg of water?

A

10 ppm

B

15 ppm

C

20 ppm

D

25 ppm

Text Solution

Verified by Experts

The correct Answer is:
C
24 mg of `MgSO_(4)` present in `10^(3)` g of water
`10^(6)` g water will contain = 24000 mg of `MgSO_(4)` = 24 g of `MgSO_(4)`
120 g of `MgSO_(4)` = 100 g of `CaCO_(3)`
So, 24 g of `MgSO_(4)=(100)/(120)xx24=20` g of `CaCO_(3)`
Hardness of water = 20 ppm
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