Question

Which of the following is not correct regarding the adsorption of a gas on the surface of solid?

• A. On increasing pressure, adsorption keeps on increasing.
• B. Enthalpy and entropy changes are negative.
• C. Chemisorption is more specific than physisorption.
• D. It is a reversible reaction.

Answer 1

The correct option is A On increasing pressure, adsorption keeps on increasing.

• The accumulation of molecular species the surface rather than in the bulk of a solid or liquid is termed adsorption.
  
• The adsorption process is exothermic, the physical adsorption occurs readily at low temperature and decreases with increasing temperature. By Le-Chatelier’s principle as the pressure increases the rate of adsorption increases but as it reaches to a saturation point then it will not increases anymore.
  

Hence, option A is correct answer.