A) Cl
B) Pb
C) B
D) Zn
Correct Answer: C
Solution :
Pyrex glass is a borosilicate glass. Its composition is \[Si{{O}_{2}}=80%,\] \[{{B}_{2}}{{O}_{3}}=12%,\]\[N{{a}_{2}}O=4%,\] \[A{{l}_{2}}{{O}_{3}}=3%\]. It is an excellent resistant to heat, acids and other laboratory reagents. Hence, it is mainly used in making laboratory apparatus (beaker, flasks) etc.
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