Maximum permissible residual chlorine in treated water should be __________ mg/litre.?

0.001 to 0.01
02 to 0.3
2 to 3
5 to 10

LohaHridoy

5 views

2025-01-04 04:42

1 Answers

AhmedNazir

Answer: Option 2

5 views Answered 2022-09-01 13:21

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