engineering recuitment WBPSC JE Civil Mock Test 2022 Environmental Engineering Water Treatment Disinfection

Order 4 disinfectants in increasing order of their disinfection power?

1
Ozone < HOCl < monochloramine < NCl3
2
Ozone < NCl3 < Monochloramine < HOCl
3
NCl3 < HOCl < Monochloramine < Ozone
4
NCl3 < Monochloramine < HOCl < Ozone
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