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A sample of hard water with hardness 150...

A sample of hard water with hardness 150 ppm is found to contain `Ca(HCO_(3))_(2)` and `CaCl_(2)`. If one litre of the smaple on boiling produce `0.108 g CaCO_3)`, then its permanent hardness is

A

42 ppm

B

32 ppm

C

15 ppm

D

10.8 ppm

Text Solution

Verified by Experts

The correct Answer is:
A
Total hardness of water sample = 150 ppm. 1 litre of water on boiling produces 0.108 g `CaCO_(3)`.
`rArr" 1000 parts by weight of water contains 0.108 parts by weight of "CaCO_(3)`.
`=108" parts by weight of "CaCO_(3)`.
`rArr" The temporary hardness of water = 108 ppm."`
`therefore" Permanent hardness of the water sample"`
`=150-108="42 ppm."`
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