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Q.

Which of the following is most thermodynamically stable allotrope of carbon?

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a

Graphite

b

Fullerene

c

Diamond

d

None of these

answer is A.

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Detailed Solution

The enthalpy change from carbon in diamond to graphite is negative. This implies that diamond should be less stable than graphite. 

Graphite has a melting point higher than diamond, indicating that it is the most stable allotrope of carbon in terms of thermodynamics.

Hence graphite is most thermodynamically stable allotrope of carbon.

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