railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Water Treatment

The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about:-

1
0.01 to 0.05 ppm
2
0.05 to 0.50 ppm
3
0.50 to 1.00 ppm
4
1.00 to 5.00 ppm
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