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Q. |
For portable water the permissible pH value is |
A. | 1 - 4.5 |
B. | 4.5 - 7 |
C. | 7 - 8.5 |
D. | 9 -- 11 |
E. | 11 -- 14 |
Answer» C. 7 - 8.5 |
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