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

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

 

  1. A

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

  2. B

    DG < 0 and decomposition of the metal oxide

  3. C

    DG = 0 and reduction of the metal oxide

  4. D

    DG > 0 and decomposition of the metal oxide

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    Solution:

    At the point of intersection

    3Mg+Al2O33MgO+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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