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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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