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A sample of water contains 0.012 g of Mg...

A sample of water contains 0.012 g of `MgSO_(4)` per litre. The hardness of the water sample in ppm is

A

20 ppm

B

10 ppm

C

25 ppm

D

15 ppm

Text Solution

Verified by Experts

The correct Answer is:
B
Equivalent mass of `MgSO_(4)=60`
`rArr" 60 g of "MgSO_(4)-="50 g of "CaCO_(3)`
`therefore" 0.012 g of "MhSO_(4)-=(50xx0.012)/(60)="0.01 g of "CaCP_(3)`
`rArr" 1 litre of water contains 0.01 parts by weight of "CaCO_(3)`
`"i.e. 1000 parts of water contains 0.01 parts by weight of "CaCO_(3)`
`rArr " "10^(6)` parts by weight of water contains 10 parts by weight of `CaCO_(3)`.
`therefore` The hardness of the water sample is 10 ppm.
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