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Question

Common impurities present in bauxite are


A

CuO

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B

ZnO

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C

CaO

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D

SiO2

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Solution

The correct option is D

SiO2


Explanation of the correct answer:

The correct answer is option D:

  • Although it is also utilised as an industrial material, bauxite is predominantly a metallic mineral.
  • It is the sole mineral utilised in the large-scale manufacture of aluminium.
  • Aluminium ore is bauxite (Al2O3).
  • The bauxite is refined to produce aluminium oxide, a white powder form from which aluminium may be recovered.
  • Bauxite deposits are mostly created by aluminous rock weathering; while some have been transported to their current locations, the majority are residual accumulations from which the majority of the other parent rock constituents, except alumina, have been leached.
  • Bauxite contains a variety of iron oxides, including hematite and goethite, Fe2O3, silicon dioxide from sand, SiO2, Kaolinite, and a trace amount of TiO2.

Explanation of the incorrect answers:

Options A, B, and C:

  1. The impurities present in Bauxite do not includeCuO, ZnO, and CaO.
  2. Thus, these options are incorrect.

Hence, option D is correct, i.e., SiO2.


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