Question

Which of the following is the ore of aluminium?
A. $ N{a_3}Al{F_6} $
B. $ A{l_2}{O_3} \cdot 2{H_2}O $
C. $ A{l_2}{O_3} $
D. $ A{l_2}{O_3} \cdot {H_2}O $

Answer 1

Hint: The world's principal supply of aluminium is bauxite ore. To make alumina, the ore must first be chemically treated (aluminum oxide). The alumina is then electrolytically melted to obtain pure aluminium metal. Bauxite is most commonly found in the topsoil of tropical and subtropical regions.

Complete answer:
Aluminium is extracted from bauxite, which is a type of mineral. Cryolite and corundum are two lesser-known aluminium ores. The chemical formula for bauxite is $ A{l_2}{O_3} \cdot n{H_2}O $ hydrated aluminium oxide.
Hence the correct option is: (B) $ A{l_2}{O_3} \cdot 2{H_2}O $ .

Additional Information:
The primary mineral of aluminium is bauxite. The Bayer Process is used to crush and purify bauxite, which is the initial stage in the production of aluminium. The bauxite is washed in a hot sodium hydroxide solution, which leaches aluminium from the bauxite, in the Bayer Process. Aluminum hydroxide, $ Al{\left( {OH} \right)_3} $ , is formed when aluminium is precipitated out of solution. After that, the aluminium hydroxide is calculated to produce alumina, $ A{l_2}{O_3} $ .

Note:
It should be noted that Bauxite is utilised in a variety of industries, including the chemical, refractory, abrasive, cement, steel, and gasoline industries. In the chemical industry, bauxite and alumina are used to make aluminium compounds. It is utilised as a raw material in the manufacture of a variety of refractory products. The metal bauxite ore is ideal for use in the manufacture of aeroplanes. Aluminium's attributes of strength, lightness, predictability, and low cost make it the perfect material for aircraft construction.