Assertion $(A)$: Adsorption is an exothermic process.
Reason $(R)$: Physisorption of a gas on a solid surface is normally reversible.

  • A
    Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$.
  • B
    Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$.
  • C
    $A$ is correct but $R$ is incorrect.
  • D
    $A$ is incorrect but $R$ is correct.

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