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Q. |
To keep the water safe against pathogenetic bacteria the residual chlorine should remain between |
A. | 10 ppm to 20 ppm |
B. | 1 ppm to 2 ppm |
C. | 0.2 to 0.8 ppm |
D. | 0.05 to 0.2 ppm |
E. | 6 ppm to 10 ppm |
Answer» D. 0.05 to 0.2 ppm |
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