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Give reasons for the following in one or...

Give reasons for the following in one or two sentences : `'Graphite is used as a solid lubricant.''

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See Fig, ( a and b. ) Grphite has a two-dimensional sheet stuture . Each carbon atom is in ` sp^(2)-`hybridised state and is sructure and is linked to three other carbon atom in a hexagonal planar structure . After forming three `C-C` bonds , each carbon atom is left with one electron in its p-orbital . This electron then overlaps with the other to form a pi-bond Hexagonal planes are held by weak Van der Waals forces These planes can slide over one another . Therefore graphite is a good lubricant .
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