Question

What is the chief constituent of Pyrex glass ?

• A. $B_2O_3$
• B. $SiO_2$
• C. $Al_2O_3$
• D. $Na_2O$

Answer 1

Answer: (B)

$SiO_2$

Answer 2

Pyrex glass is obtained by fusing toghether 60 to $80 \% SiO _{2}, 10$ to $25 \% B _{2} O _{3}$ and remaining amount of $Al _{2} O _{3}$.
$SiO _{2}$ is the chief constituent of Pyrex glass.