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Graphite is a soft solid lubricant extre...

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite

A

is a non-crystalline substance

B

is an allotropic form of diamond

C

has molecules of variable molecular masses like polymers

D

has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds

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