The point of intersection and sudden increase in the slope, in the diagram given below respectively, indicates:

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DG = 0 and melting or boiling point of the metal oxide

DG < 0 and decomposition of the metal oxide

DG = 0 and reduction of the metal oxide

DG > 0 and decomposition of the metal oxide

answer is A.

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Detailed Solution

At the point of intersection3Mg+Al2O3⇌3MgO+2Al ΔG=0 (Equilibrium)Sudden increase indicates change of physical state from solid to liquid (M.P) (or) liquid to Vapour (B.P)[Note : actually sudden increase in slope is due to change in physical state of metal, not due to change in physical state of metal oxide. But among the given option-1 is best choice.]

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