In the extraction of aluminium Process X : employed for red…

Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

In the extraction of aluminium Process X : employed for red bauxite to remove iron oxide (main impurity)

Process Y: (Serpeck`s process) : used for white bauxite to remove Z (main impurity) then,

Select correct option for the process X and impurity Z.

X = Hall and Heroult`s process and Z = SiO2

X = Bayer`s process and Z = SiO2

X = Serpeck`s process and Y = iron oxide

X = Bayer`s process and Y = iron oxide

Text Solution

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The correct answer is:

(X) Red bauxite contains the impurities of oxides of iron and silicates. In Bayer process, alumina is dissolved by reacting sodium hydroxide solution leaving behind the insoluble oxide of iron.

(Y) White bauxite contains the impurity of silica which is removed by Serpeck's method.

Al2O3 + N2 + 3C 2AlN + 3CO ; SiO2 + 2C Si + 2CO

AlN + 3H2O Al(OH)3 + NH3 ; 2Al(OH)3 Al2O3 + 3H2O.

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