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JEE Main levelSingle correct optionDifficulty 2 of 3pb063

Assertion (A): Graphite is used as a dry lubricant. Reason (R): The layers of graphite are held together by strong covalent bonds.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: C

Graphite is a lubricant because its layers are held by weak van der Waals forces and slide over one another, so A is true. The strong covalent bonds exist only within a layer, not between layers, so R is false.
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