Adsorption is accompanied by : also explain

A)

decrease in enthalpy of the system

  • B)

    increase in entropy of the system

  • C)

    increase in free energy of the system

  • D)

    increase in both enthalpy and entropy

Adsorption process is always exothermic and so change in enthalpy is always negative.
It is a spontaneous process and leads to decrease in free energy.
Adsorption leads to decrease in entropy i.e. change i entropy is negative because the adsorbate molecules gets lesser opportunity to move about on the surface of adsorbent.
Therefore, option A is the correct answer.

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