Haryana PMT Haryana PMT Solved Paper-2009

  • question_answer
    Adsorption of gases on solid surface is exothermic since

    A)  enthalpy is positive

    B)  entropy is negative

    C)  entropy increases

    D)  free energy increases      

    Correct Answer: B

    Solution :

                    During adsorption, the molecules of adsorb ate (.ie, gaseous molecules) are held on the surface of the adsorbent leading to the decrease in randomness. Therefore, entropy decreases, ie, \[\Delta S\] is negative.


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