Thermodynamically, in which form of carbon is the most stable?

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Coal

Fullerenes

Diamond

Graphite

answer is D.

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Detailed Solution

Concept- Numerous allotropes of carbon, some of which may be crystalline or amorphous, are known to exist. Allotropes are structurally distinct versions of an element with varying physical characteristics but the same chemical characteristics. Diamond, graphite, fullerenes, and carbon nanotubes are examples of crystalline allotropic forms of carbon, whereas coal, charcoal, and coke are examples of amorphous allotropic forms.
Graphite is a different type of carbon allotrope. Graphite is a good electrical conductor, unlike diamond. It is used by both electric lamps and electrodes. Under typical circumstances, graphite is the most stable allotrope of carbon. It is used as a benchmark to determine the heat of production for carbon compounds.
Hence, the correct answer is option (4).

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