1.

Delta H for transition of carbon in the diamond form to carbon in the graphite form is -453.5 cal. This suggests that :

Answer»

GRAPHITE is CHEMICALLY DIFFERENT from DIAMOND
Graphite is as STABLE as diamond
Graphite is more stable than diamond
Diamond is more stable than graphite

Solution :`C_("Diamond")rarr C_("Graphite") , Delta H =-453.5` Cal
In exothermic reactions products are more stable than reactans, so graphite is more stable than diamond.


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