A) \[PbO\]
B) \[MgO\]
C) \[{{B}_{2}}{{O}_{3}}\]
D) \[A{{l}_{2}}{{O}_{3}}\]
E) \[{{P}_{2}}{{O}_{5}}\]
Correct Answer: C
Solution :
Boric anhydride or boron oxide,\[{{B}_{2}}{{O}_{3}},\]if present, makes the glass heat resistant.
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