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Social & Preventive Medicine General c7b0fad2

Residual chlorine in chlorination of water should be –

A
1 mg/1 after 1 hr
B
0.5 mg/1 after 1 hr
C
1 mg/1 after 30 mins
D
0.5 mg/1 after 30 mins
High-Yield Explanation
No explanation provided.

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