The maximum permissible hardness for public supplies is (A) 95 mg/litre (B) 105 mg/litre (C) 115 mg/litre(D) 125 mg/litre

The maximum permissible hardness for public supplies is 

(A) 95 mg/litre 

(B) 105 mg/litre 

(C) 115 mg/litre

(D) 125 mg/litre

by

1 Answer

Answer :

(C) 115 mg/litre

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