In physisorption adsorbent does not show specificity for any particular gas
because ______________.
(i) involved van der Waals forces are universal.
(ii) gases involved behave like ideal gases.
(iii) enthalpy of adsorption is low.
(iv) it is a reversible process.
NCERT Class XII
Chemistry - Exemplar Problems
Chapter 5. Surface Chemistry
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In physisorption adsorbent does not show specificity for any particular gas
because ______________.
(iv) it is a reversible process.
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In physisorption, adsorbent does not show specificity for any particular gas because involved van der Waals forces are universal.
Option (i)
Explanation:
- Physisorption is reversible in nature because the desorption of gas occur either by increasing the temperature or decreasing the pressure. It doesn't depend upon nature of gas, whether ideal or real.
- In physisorption, adsorbent and adsorbate get attached with the support of vander Waals forces, which is irrespective of the nature of gas. It involves use of weak 'Van der Waal forces' by means of which gas molecules get ingested on a solid surface. There is no carefulness as any gas can be devoured onto the surface.
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