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 ÎfG0=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 ÎfG0=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 鍗.
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Detailed Solution
All oxides cant decompose as stated in option-4.
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