Graphite is a soft solid lubricant extremely difficult to melt. The...

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Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite :
(1) Has molecules of variable molecular masses like polymers
(2) Has carbon atoms arranged in large plated of rings of strongly bonded carbon atoms with weak interplate bonds
(3) Is a non crystalline substance
- (4) Is an allotropic form of diamond
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