Q. The permissible level of HCN in drinking water is (Solved)

1. Less than 0.01 mg/litre

2. Around 1 mg/litre

3. Around 5 mg/litre

4. Between 10 to 20 mg/litre

5. More than 50 mg/litre

  • a. Less than 0.01 mg/litre
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