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Answer» Fullerenes have dangling bonds Fullerenes are cage-like MOLECULES Graphite is thermodynamically most stable allotrope of carbon Graphite is slippery and hard and THEREFORE used as a dry lubricant in machines Solution :Fullerenes are cage like molecules. C-60 molecule has the shape like a SOCCERBALL and called Buckminsterfullerenes. Graphite is thermodynamically most stable allotrope of carbon and therefore, `Delta_f H^ɵ` of graphite is taken as zero. `Delta_f H^ɵ` values of DIAMOND and fullerene, C-60 are 1.90 and 38.1 kJ `"mol"^(-1)`, respectively.
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