Social & Preventive Medicine The minimum recommended conecntration of free chlorine (mg/L) in drinking water at the end of 1 hour is – A 0.1 B 0.5 C 1 D 1.5 💡 Explanation The minimum recommended conecntration of free chlorine (mg/L) in drinking water at the end of 1 hour is - ✓ Correct Answer: B. 0.5