Ruby is an oxide of

A. silver
B. gold
C. platinum
D. aluminum oxide

Check Answer

The correct answer is D. Aluminum oxide.
Ruby is a form of aluminum oxide (Al2O3) that exhibits a bright red color due to the presence of trace amounts of chromium. It is a precious gemstone and is commonly used in jewelry. Aluminum oxide is a compound that is composed of aluminum and oxygen, and it occurs naturally as the mineral corundum. Corundum is a common mineral that is found in a variety of different rocks and soils around the world, and it is the main source of aluminum ore.
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