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| Q. |
Raw materials used for the manufacture of glass are – |
| A. | sand, soda, limestone |
| B. | sand, charcoal, soda |
| C. | limestone, charcoal, sulphur |
| D. | sand, sulphur, soda |
| Answer» A. sand, soda, limestone | |
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Explanation: Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special applications, it is not very common due to its high glass transition temperature of over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing. |
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