Which one of the following minerals is formed by the decomposition of rocks, leaving a residual mass of weathered materials?

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Coal

Bauxite

Gold

Zinc

answer is B.

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Detailed Solution

Bauxite is a mineral formed by the decomposition of rocks, leaving a residual mass of weathered materials. Bauxite is chemically an oxide of aluminium and is an important ore of aluminium. Both physical and chemical weathering can form it. In India, bauxite deposits are mainly found in the plateau regions of Maikal hills, Bilaspur-Katni and Amarkantak range. They are formed due to the decomposition of a wide variety of rocks rich in aluminium and silicon. The physical weathering of bauxite involves breaking down rocks rich in aluminium silicates present on the earth's surface. The chemical weathering of bauxite involves the process of lateralisation in which the letter ride soil undergoes a chemical change and forms bauxite as the precipitate.

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