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Social & Preventive Medicine General 439900d4

Residual chlorine in chlorination of water should be-

A
1 mg// after 1 hr
B
0.5 mg/1 after 1 hr
C
1 melt after 30 mins
D
0.5 mg/1 after 30 mins
High-Yield Explanation
Ans. is 'b' i.e., 0.5 mg/I, afterl hr

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