Correct order of standard enthalpy of formation of diamond graphite, and fullerene is
A
ΔfH∘fullerene>ΔfH∘diamond>ΔfH∘graphite
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B
ΔfH∘diamond>ΔfH∘graphite>ΔfH∘fullerene
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C
ΔfH∘fullerene>ΔfH∘graphite>ΔfH∘diamond
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D
ΔfH∘graphite>ΔfH∘diamond>ΔfH∘fullerene
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Solution
The correct option is AΔfH∘fullerene>ΔfH∘diamond>ΔfH∘graphite Graphite is thermodynamically the most stable allotrope of carbon and therefore ΔfH∘ of graphite is taken as zero. ΔfH∘ of diamond:1.90kJmol−1 ΔfH∘ of fullerene:38.1kJmol−1