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| Q. |
Which variety of glass is heat resistant? |
| A. | Hard glass |
| B. | Flint glass |
| C. | Pyrex glass |
| D. | Bottle glas |
| Answer» C. Pyrex glass | |
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Explanation: Older clear-glass Pyrex manufactured by Corning, Arc International's Pyrex products, and Pyrex laboratory glassware are made of borosilicate glass. |
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