MCQOPTIONS
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| 1. |
Polyformaldehyde has a good stability up to _____ |
| A. | 50<sup>o</sup>C |
| B. | 100<sup>o</sup>C |
| C. | 150<sup>o</sup>C |
| D. | 250<sup>o</sup>C |
| Answer» D. 250<sup>o</sup>C | |