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  4. The principal constituent of pyrex glass is:

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Q. The principal constituent of pyrex glass is:

JIPMERJIPMER 2002

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.