1. Civil Engineering
  2. Environmental Engineering
  3. The permissible level of HCN in drinking...
Q.

The permissible level of HCN in drinking water is

A. Less than 0.01 mg/litre
B. Around 1 mg/litre
C. Around 5 mg/litre
D. Between 10 to 20 mg/litre
E. More than 50 mg/litre
Answer» A. Less than 0.01 mg/litre
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