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Hardness of Water:Causes, Types and Treatments

Question

If a sample of hard water contains $68$ ppm of $C a S O_{4}$ , then the hardness of the same sample of water is:
$68$
$100$
$200$
$50$

A

68

B

100

C

50

D

200

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Solution

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In $136$ ppm of calcium sulphate, the degree of hardness is $100$ .

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