Question

Which of the following represents correct statement(s)?

• A. When molten glass is cooled rapidly it becomes brittle.
• B. When the molten glass is cooled very slowly, it will not allow light to pass through.
• C. The glass should be cooled gradually. It should not be cooled either very slowly or rapidly.
• D. All of the above.

Answer 1

The correct option is D All of the above.

All of the following represents correct statements.
When molten glass is cooled rapidly it becomes brittle.
When the molten glass is cooled very slowly, it will not allow light to pass through.
The glass should be cooled gradually. It should not be cooled either very slowly or rapidly. Gradual cooling of glass is called annealing.