Question

The major binding force in graphite is
a) ionic bond
b) covalent bond
c) hydrogen bond
d) London force

Answer 1

Graphite is formed by very thin layers of carbon weakly bond together by short range forces (called Van der Waals forces). In each of these layers, each atom of carbon is only bonded to three other carbon atoms from the same "sheet" (in 2D). Those layers of carbon are actually so weakly bonded together that they can in fact slip upon each other with little effort. This is why graphite can indeed be used in dry lubricants. See hereunder a schematic view of the overlapping layers, making up graphite.
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