1.

What is the difference between Physisorption and chemisorption.

Answer»
S. No.PhysisorptionChemisorption
(i)Because of van der Waals forces.Caused by chemical bond formation.
(ii)ReversibleIrreversible
(iii)Enthalpy of adsorption is low (20-40 kJ/mol)Enthalpy of adsorption is high (80-240)kJ/mol

Detailed Answer:

S. NoPhysisorptionChemisorption
(i)It arises by weak van der Waals forces.It arises by strong forces like chemical bond. 
(ii)It usually takes place at a low temperature and decreases with increasing temperature.It takes place at a high temperature and increases with increase in temperature.
(iii)It is reversible.It is irreversible.
(iv)It depends on the ease of liquification of the gas.The extent of adsorption is not related to liquification of the gas.
(v)It is not very specific.It is highly specific.
(vi)It forms multi-molecular layers.It forms mono-molecular layers.
(vii)It does not require any activation energy.It requires activation energy.


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