Which pair of statements about diamond and graphite is correct?
Diamond and graphite are both pure carbon. They are both macromolecules.
2 )
Diamond and graphite can both be used as electrodes. Graphite is also used as a lubricant.
3 )
Diamond has covalent bonds. Graphite has ionic bonds.
4 )
Diamond is hard with a high melting point. Graphite is soft with a low melting point.
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