Q. The permissible level of HCN in drinking water is (Solved)
1. More than 50 mg/litre
2. Around 1 mg/litre
3. Less than 0.01 mg/litre
4. Between 10 to 20 mg/litre
5. Around 5 mg/litre
- c. Less than 0.01 mg/litre
1. More than 50 mg/litre
2. Around 1 mg/litre
3. Less than 0.01 mg/litre
4. Between 10 to 20 mg/litre
5. Around 5 mg/litre