Home › UP Board Class 10 › chemistry › Carbon and its Compounds › Why does graphite act as a lubricant?
Why does graphite act as a lubricant?
AIts layers can slide over each other
BIt is a metal
CIt dissolves friction
DIt absorbs oil from contact surfaces
Answer & Solution
Correct answer: A. Its layers can slide over each other
1. Graphite consists of hexagonal layers of carbon atoms.
2. Strong covalent bonds hold each layer together internally.
3. Adjacent layers are held only by weak van der Waals forces.
4. Weak inter-layer forces let the layers slide past each other easily.
5. This sliding ability gives graphite its lubricating property.
6. Diamond cannot do this because all bonds are equally strong.
_Source: NCERT Class 10 Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_
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