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If 1 kg of water contains 12 mg magnesiu...

If 1 kg of water contains 12 mg magnesium sulphate its degree of hardness is

A

50 ppm

B

60 ppm

C

12 ppm

D

10 ppm

Text Solution

Verified by Experts

The correct Answer is:
D
`13 mg MgSO_(4) rArr 12xx10^(-3) mg of MgSO_(4)`
`MgSO_(4)` hardness `=(12xx10^(-3)g)/(10^(3)g)xx10^(6)g=12` ppm
`rArr 12g of MgSO_(4)` in `10^(6)g` of water
hardness in terms of `CaCO_(3)=12xx(100)/(12)=10` ppm
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