MCQOPTIONS
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MCQOPTIONS
| 1. |
Minimum chlorine content of water after chlorination should be ? |
| A. | 0.5 mg/L |
| B. | 5 mg/L |
| C. | 0.05 mg/L |
| D. | 50 mg/L |
| Answer» B. 5 mg/L | |