CHXII01:THE SOLID STATE
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Graphite is a soft lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite:
1 is a non-crystalline substance
2 is an allotropic form of diamond
3 has molecules of variable molecular masses like polymers
4 has carbon atoms arranged in large plates of ring of strongly bound carbon atoms with weak interplate bonds
Explanation:
Due to layer structure