question_answer 45)

    In physisorption adsorbent does not show specificity for any particular gas because......... (a) involved van der Waals' forces are universal (b) gases involved behave like ideal gases (c) enthalpy of adsorption is low (d) it is a reversible process

Answer:

                    (a) In physisorption adsorbent does not show specificity for any particular gas because involved van der Waals' forces are universal. It means extent of van der Waals' interaction between adsorbate and adsorbent is constant for all gases.