Gemstone Ruby – This question was asked in:
Tehsildar Paper II 2020 (Evening)
A. Sodium carbonate
B. Copper oxide
C. Aluminium oxide
D. Magnesium oxide
Answer
Option C: Aluminium oxide (Al2O3)
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Detailed Solution – Gemstone Ruby
The gemstone Ruby mainly contains Aluminium oxide (Al2O3) with some impurities.