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    				| 1. | Which of the chief constituent of pyrex glass ?A. `B_(2)O_(3)`B. `SiO_(2)`C. `Al_(2)O_(3)`D. `Na_(2)O` | 
| Answer» Correct Answer - B The chief constituetof pyrex glass is `SiO_(2)`. Pyrex glass is obtained by fusing `60`to `80% SiO_(2)`, `10 -25%` `B_(2)O_(3)` and remaining amount of `Al_(2)O_(3)`. | |