Question

What is the chief constituent of Pyrex glass?
A. ${B_2}{O_3}$
B. $Si{O_2}$
C. $A{l_2}{O_3}$
D. $Na{O_2}$

Answer 1

Hint- To solve this question, we need to know about the Pyrex glass. Pyrex glass is firstly produced by The Corning Inc Glass Works company. It is a borosilicate glass. When we heat a raw material like silica sand and boric oxide in extremely very high temperatures for extended periods of time then Pyrex glasses are formed in very high temperature material molten and then processed into different types of glassware to form a Pyrex glass.

Complete step-by-step answer:
Pyrex is a very important material for a many number of applications that require heat and chemical resistance. If we want to know why Pyrex glass is unique it is very important to know more about the nature of glass.
Formers, fluxes, and stabilizers are Three classes of materials used in making Pyrex. For making glass Formers are the main ingredients in all three classes. All These are crystalline materials. When we heated this crystalline material in extremely very high temperatures it melted and cooled to create glass. Fluxes are compounds and Stabilizers are materials that help keep glass from crumbling or falling apart.
Glass has similar characteristics to both crystalline solids and liquids. And it also a state of matter if we see a glass through macroscopic level glass appears to be like solids
Therefore, option (B) is the correct answer.

Note- We say that Pyrex glass is obtained when 60 to 80% $Si{O_2}$ and 10 to 25% ${B_2}{O_3}$ and remaining amount of $A{l_2}{O_3}$ fusing together The main difference between Pyrex and glass is that Pyrex is tempered glass and used for cook wares but glass is mostly used for architecture and furniture and for many other purpose.