JEE Main 2003 Chemistry question

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

(1)is an allotropic form of diamond
(2)has molecules of variable molecular masses like polymers
(3)has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bondsCorrect
(4)is a non-crystalline substance

Answer: (3)

Solution

In graphite, each carbon is -bonded to three others in flat hexagonal layers held by strong covalent bonds (hence a very high melting point), while the layers are held together by weak van der Waals

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Question ID VK-038167