Question

In physisorption adsorbent does not show specificity for any particular gas because:

• A. the involved van der waals forces are universal.
• B. the gases involved behave like ideal gases.
• C. enthalpy of adsorption is low.
• D. it is a reversible process.

Answer 1

The correct option is A the involved van der waals forces are universal.

In physisorption, the gas molecules accumulates on surface of a solid on account of weak van der Waal's force.

The surface of an adsorbent does not show any preference for a particular gas as the van der Waals’ forces are universal.

Hence, there is no specificity as any gas can be adsorbed on to the surface .