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The hardness of water sample containing ...

The hardness of water sample containing 0.002 mol of magnesium sulphate dissolved in a litre of water is expressed as:

A

20ppm

B

200ppm

C

2000ppm

D

120ppm

Text Solution

Verified by Experts

The correct Answer is:
B
`10^(6)`g water contains `(0.002 xx 1000) mol MgSO_(4)`
`1mol MgSO_(4) ~= 1mol CaCO_(3)`
`therefore 2mol MgSO_(4) ~= mol CaCO_(3)` i.e., `2 xx 100g CaCO_(3)`
`therefore` Hardness of water = 200ppm
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