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Why is graphite used as a lubricant?

Answer and explanation

Correct answer: Its layers can slide easily

Graphite has a layered covalent structure. Strong covalent bonds hold carbon atoms within each sheet, but the forces between adjacent sheets are weak. When graphite is rubbed between surfaces, these sheets slide over one another and reduce friction. Thus option A correctly explains its lubricating action. Option B describes diamond more closely, while graphite is neither rapidly water-soluble nor an ionic liquid, so C and D are incorrect.

Related tags

GraphiteLubricantLayer StructureCovalent BondingCarbon And Its CompoundsScienceClass 10 Mcq

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