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Adsorption of gases on solid surface is ...

Adsorption of gases on solid surface is exhothermic since

A

enthalpy is positive

B

entropy is negative

C

entropy increases

D

free energy increases

Text Solution

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The correct Answer is:
B
During adsorption, the molecules of adsorbate (i.e., gaseous molecules) are held on the surface of the adsorbent leading to the decrease in randomness. Therefore, entropy decreases, i.e., `DeltaS` is negative.
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Knowledge Check

  • Adsorption of gases on solid surface is an exothermic eaction because

    A
    free energy increases
    B
    enthalpy is positive
    C
    entropy increases
    D
    enthalpy is negative.

  • Adsorption of gases on solid surfaces is exothermic reaction because

    A
    Free energy increases
    B
    Enthalpy is positive
    C
    Entropy increases
    D
    Enthalpy is negative

  • Spontaneous adsorption of a gas on a solid surface is exothermic process because

    A
    enthalpy of the system increase.
    B
    enthropy increases.
    C
    entropy decreases
    D
    free energy change increase.

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