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| 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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