In the following question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices:
Assertion: Physical adsorption of molecules on the surface requires activation energy .
Reason : Because the bond of adsorbed molecules are broken.
Answer & explanation
Correct answer: option 4
No appreciable activation energy is needed for physical adsorption of molecules on the surface. Enthalpy of chemisorption is high as it involves chemical bond formation. No bonds are broken between adsorbed molecules.
Therefore, both assertion and reason are incorrect.