The correct statements with respect to Ellingham’s diagram among the following are
I) Magnesium reduces aluminium oxide below 1700K
II) Aluminium reduces magnesium oxide above 1700K
III) Aluminium reduces magnesium oxide below 1700K
IV) Magnesium reduces aluminium oxide above 1700K

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I & II

II & III

III & IV

II, III & IV

answer is A.

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Detailed Solution

The correct statements with respect to Ellingham's diagram are I & II
(I) Magnesium reduces aluminium oxide below 1700 K.
Below 1700 K, ΔG^o for the reaction 2Mg+O₂→2MgO is more negative than ΔG^o for the reaction 4/3 Al+O₂→2/3 Al₂O₃

(II) Aluminium reduces magnesium oxide above 1700 K
Above 1700 K, ΔG^o for the reaction 2Mg+O₂→2MgO is less negative than ΔG^o for the reaction 4/3Al+O₂→2/3 Al₂O₃
More negative the value of ΔG^o, the greater is the tendency of the element to combine with oxygen.
Hence, the option (A) is the correct answer.