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Solution:concept - is an inorganic chemical agent with the chemical name Aluminium Oxide. To determine its nature, it is treated with both acid and base.
occurs naturally as corundum, ruby, sapphires, and emeralds. It is an amphoteric substance that reacts with both acids and bases. It occurs as a solid and appears white. It is odourless and insoluble in water. The most common occurrence of this compound is in a crystalline form, called α-alumina or corundum. Due to its hardness, it is widely used and suitable for use as an abrasive and in cutting tools.
Thus, the Aluminium oxide is amphoteric in nature as it reacts with both acid and base and forms the salts and water as products.
Hence, the correct answer is 3.