Home Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General Which of the following metals cannot be extr…
Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General Single Correct MCQ
Published on: August 13, 2026

Which of the following metals cannot be extracted by the carbon reduction process?

A
Zn
B
Fe
C
Al
D
Sn

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Text Solution

Verified by Experts
The correct answer is:
C

Aluminium is extracted by electrolytic reduction of mixture of molten Al2O3 + Na3AlF6 + CaF2 .

Due to very high energy of dissociation of Al2O3 , the reduction at such high temperature will give carbide in place of metallic Al according to the following reaction. 2Al2O3 + 6C Al4C3 + 3CO2 .

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