The minimum potential difference needed to reduce Al 2 O 3 …

Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General Subjective Type

Published by: CGP EDU Academic Team

Published on: August 14, 2026

The minimum potential difference needed to reduce Al 2 O 3 at 500ºC is :

The reaction for decomposition is :

Al 2 O 3 Al + O 2 Δ G = + 960 kJ at 500ºC.

(Report your answer as potential difference × 2)

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The correct answer is:

CHECK THE SOLUTION.

Sol. Hence, the change in oxidation number of aluminium is 3 per mole. Since 4/3 moles of Al are produced n = 3 × 4/3 = 4

E ext = = 2.5 V

A potential difference of at least 2.5 V must be applied to the oxide to bring about reduction.

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