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Standard X
Chemistry
Versatile nature of carbon
Question

Which pair of statements about diamond and graphite is correct?

A
Diamond and graphite are both pure carbon. They are both macromolecules.
B
Diamond and graphite can both be used as electrodes. Graphite is also used as a lubricant
C
Diamond has covalent bonds. Graphite has ionic bonds.
D
Diamond is hard with a high melting point. Graphite is soft with a low melting point.
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Solution
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Correct option is A. Diamond and graphite are both pure carbon. They are both macromolecules.
Diamond and graphite are macromolecules and contain only carbon. Both are the allotropes of carbon.
Graphite is a good conductor of electricity thus used as an electrode. Diamond is a bad conductor of electricity thus not used as an electrode.
Both Diamond and Graphite have a covalent bond.
Graphite has a melting point similar to that of diamond of around 3600°C, at which it sublimes rather than melting.
Hence option A is correct.

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