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JEE Main levelSingle correct optionDifficulty 2 of 3pb191

Graphite is used as a dry lubricant because

Aits layers are held by weak van der Waals forces and slide over each other
Bits carbon atoms are $s p^{3}$ hybridised
Ceach layer is held to the next by strong covalent bonds
Dit contains free $C X^{+}$ ions that reduce friction

Answer: A

Within a layer the bonding is strong covalent, but the layers interact only through weak van der Waals forces. They therefore shear easily, which makes graphite soft and slippery.

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