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Hardness of Water and Treatment

Question

If a sample of water contains $30$ ppm of $M g S O_{4}$ , then its hardness is :
$25$ ppm
$20$ ppm
$30$ ppm
$150$ ppm

A

25

ppm

B

150

ppm

C

20

ppm

D

30

ppm

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Solution

Verified by Toppr

Molecular weight of $M g {S O}_{4}$ $= 120$ gms.
$120$ gms of $M g {S O}_{4}$ has hardness $= 100$ ppm.
$30$ ppm of $M g {S O}_{4}$ has hardness $= \frac{100}{120} \times 30 = 25$ ppm.

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