Q.

Select the correct statements (Ellingham diagram):

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a

When temperature is raised, a point will be reached where the graph crosses the Î”fG0=0 line. Below this temperature, the free energy of formation of the oxide is negative, so the oxide is stable.

b

When the temperature is raised, d point will be reached where the graph crosses the Î”fG0=0 line. Above this temperature, the free energy of formation of the oxide is positive, and the oxide becomes unstable, and should decompose into the metal and dioxygen.

c

Theoretically, all oxides can be decomposed to give the metal and dioxygen if a sufficiently high temperature can be attained.

d

Theoretically, all oxides cannot be decomposed to give the metal and dioxygen if a sufficiently high temperature can be attained.

answer is .

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Detailed Solution

All oxides cant decompose as stated in option-4.
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