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Q.

Which of the following statement is correct with respect to the following graph?

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a

Above 1623 K, Al reduces MgO

b

Both (1) & (2) are wrong       

c

Both (1) & (2) are correct

d

Below 1623 K, Mg reduces Al2O3

answer is C.

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Detailed Solution

The Ellingham diagram, the element which is present below can reduce the metal which is present above it. Below 1623 K, Mg can reduce Al2O3 since curve of Mg lies below the curve of Al2O3 below 1623 K but after 1623 K curve of Al2O3 is present below the slope of Mg, so after 1623 K, Al can reduce MgO.

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