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1 mark

Assertion (A): Graphite is slippery and is used as a lubricant.
Reason (R): Graphite has free electrons.

  1. A
    Both A and R are true and R is the correct explanation of A.
  2. B
    Both A and R are true but R is not the correct explanation of A.
  3. C
    A is true but R is false.
  4. D
    A is false but R is true.

Solution & Step-by-step Explanation

Assertion (A) is true; graphite has a layered structure with weak van der Waals forces between layers, allowing them to slide over one another easily, making it slippery and useful as a solid lubricant. Reason (R) is also true; each carbon atom in graphite is bonded to three other carbon atoms, leaving one free valence electron per atom, which allows it to conduct electricity. However, the presence of free electrons explains its electrical conductivity, not its slippery nature.

Practice this question

Try it yourself before checking the explanation above.

Assertion (A): Graphite is slippery and is used as a lubricant.
Reason (R): Graphite has free electrons.
A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false but R is true.

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Non-MetalsCarbon AllotropesMaterial Properties

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