Question

Choose the correct statement for chemical adsorption:

• A. Value of adsorption enthalpy is above $-20kJmo{l}^{-1}$
• B. Van der Waals forces exist between adsorbent and adsorbate
• C. Usually monomolecular layer is formed on adsorbent
• D. Multimolecular layer may be formed on adsorbent

Answer 1

Answer: (A), (C)

The correct options are
A Value of adsorption enthalpy is above $-20kJmo{l}^{-1}$
C Usually monomolecular layer is formed on adsorbent

The value of chemical adsorption is above 20KJ/mol is correct statement.
Hence option A is correct.