With respect to graphite and diamond, which of the statement(s) given below is (are) correct ? (a) Graphite is harder than diamond.(b) Graphite has higher electrical conductivity than diamond.(c) Graphite has higher thermal conductivity than diamond.(d) Graphite has higher C–C bond order than diamond.
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Graphite can conduct electricity because of the delocalised (free) electrons in its structure. These arise because each carbon atom is only bonded to 3 other carbon atoms. ... However, in diamond, all 4 outer electrons on each carbon atom are used in covalent bonding, so there are no delocalised electrons.
graphite and graphene, diamond is the best thermal conductor around room temperature, having thermal conductivity of more than 2,000 watts per meter per Kelvin, which is five times higher than the best metals such as copper.
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