Question

Why physical adsorption decreases with increase in temperature?

Answer 1

Adsorption is an exothermic process. So, rate of adsorption decreases whenever temperature is increases. This due to the fact that, when temperature is increases, the kinetic energy of adsorbed molecules gets increased and they overcome the electrostatic force of attraction by the adsorbent surface.

Answer 2

Physical adsorption decreases with increase in temperature because less number of molecules get absorbed on the surface with increase in temperature.

Explanation:

• When particles of a substance comes in contact with solid or liquid surface then they tend to get absorbed on the surface. This process is known as physical adsorption.

• As temperature is the measure of kinetic energy of particles of a substance. So, more is the temperature more will be randomness of the molecules. Therefore, molecules will face difficulty to get adsorbed on the surface of adsorbent.

• As a result, adsorption will decrease as there will occur increase in temperature. Hence, less amount of mass will get deposited on the surface of adsorbent. Also we can say increase in temperature will favor desorption.

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