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Q. |
The maximum permissible chlorine content for public supplies should be between |
A. | 0.1 to 0.2 ppm |
B. | 0.3 to 0.4 ppm |
C. | 1.2 to 4 ppm |
D. | 6.5 to 8 ppm |
Answer» A. 0.1 to 0.2 ppm |
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