Question

The major component of pyrex glass is

1. PbO
2. B₂O₃
3. Al₂O₃
4. MgO

Answer 1

Correct Answer - Option 2 : B₂O₃

The correct answer is B₂O₃.

CONCEPT:

• Glass is a transparent material obtained when a complex mixture of highly viscous silicates, upon moderately rapid cooling, solidifies to an amorphous rigid body without crystallization.
• It is essentially a supercooled liquid.
• Different types of glasses: Soda glass, Pyrex glass, Jena glass etc.

EXPLANATION:

• Pyrex glass is borosilicate glass, which contains B₂O₃ as its major ingredient.
• It is obtained by fusing together quartz/sand, sodium carbonate, aluminum oxide, boric oxide.
• It has a very low coefficient of thermal expansion and is able to withstand large temperature changes.
• It is used for making laboratory glassware and cookware that can be heated to high temperatures.