[Solved] Ruby and sapphire are oxides of –

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Q.	Ruby and sapphire are oxides of –
A.	copper
B.	tin
C.	iron
D.	aluminium
Answer» D. aluminium
Explanation: Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have differentcolours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange.

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