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| Q. |
The change in colour is sharper at the PH of |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» B. 10 | |
| Explanation: the change in the colour of the ions is sharper at the ph of the 10 than that of the other ranges of the ph. | |
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