Percentage content of silica in window glass, is
A. 40 to 45
B. 50 to 55
C. 60 to 65
D. 70 to 75
Answer: Option D
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Ordinary window glass composition
Silica (SiO₂): 72%
Soda (Na₂O): 14%
Lime (CaO): 10%
Small amounts of magnesia, alumina, and other oxides: 4%
The average content of silicon dioxide in glass is