Basic oxide is absent in ___________________ glass?
Correct answer: D. Quartz
- A. Flint
- B. Pyrex
- C. All A, B. & C
- D. Quartz
Explanation
Quartz glass is essentially pure silica, so it contains no basic oxide such as sodium, calcium, or lead oxide. Flint and Pyrex glasses contain modifying metal oxides.
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