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Question

Al2O3 can be reduced by carbon at a temperature of :


A
30C
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B
500C
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C
1000C
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D
>2500C
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Solution

The correct option is D >2500C
Explanation:
An Ellingham diagram is a graph showing the temperature dependence of the stability for compounds. This analysis is usually used to evaluate the ease of reduction of metal oxides and sulfides. These diagrams were first constructed by Harold Ellingham in 1944.
Carbon cannot be used in the reduction of Al2O3 in metallurgy. Aluminum oxide is a very stable oxide and lies below the oxidation line of carbon in Ellingham Diagram. Hence, Al2O3 cannot be reduced by carbon as it is energetically not favorable.
A very high temperature is required. Al2O3 can be reduced by carbon at a temperature >2500C as it is a stable oxide.

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