Q. The permissible level of HCN in drinking water is

(A) More than 50 mg/litre
(B) Around 1 mg/litre
(C) Less than 0.01 mg/litre
(D) Between 10 to 20 mg/litre

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✅ Correct Answer: (C) Less than 0.01 mg/litre

Published by Mr. Dubey ⭐ 111.54K Points at 19-Sep-2023 08:08 pm in Environmental Engineering

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