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For a reaction 4 M(s) +nO2(g) to 2M2On(s...

For a reaction `4 M(s) +nO_2(g) to 2M_2O_n(s)`,
the free energy change is plotted as a function of temperature. The temperature below which the oxide is stable could be inferred from the plot as the point at which :

A

the siope changes from negative to positive

B

the free energy change shows a changge from negative to positive

C

the slopw changes from positive to negative

D

the slope changes from positive to zeros

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