One degree of hardness of water means a content of salts of – McqOptions

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1.	One degree of hardness of water means a content of salts of
A.	10.25 mg/litre
B.	12.25 mg/litre
C.	14.25 mg/litre
D.	16.25 mg/litre.
E.	20 mg/litre.
Answer» D. 16.25 mg/litre.

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