explain the answers please. Van der Waals force of attraction is weak at low tem

Question

explain the answers please.

Van der Waals force of attraction is weak at low temperatures and ce physicul adsorption is favored at high temperaturc. 3. In adsorption, the adsorbate s uniformly distributed throughout the bulk of the solid. 5. Catalysts are classified as organic and inorgaric based on the substances from which a catalyst is made. Duplication of the chemical constitution of a good catalyst is no guarantee hat the solid prducedill have any catalyic activity since it is the crystalline structure which somehow imparis cataiytic activity to a material. Physical adsorption is reversible since at low pressure adsorption tukes place whereas high pressures causes desorption. More successful collision are achievod by giving particles must morc energy or by Lowering the activation eergy

Explanation / Answer

As you have not mentioned for a specific question, I am giving you the first answer only.

1.Actually,physical adsorption decreases with rise in temperature.The reason behind this is that,when temperature increases,the kinetic energy of adsorbed molecule also experiences a rise in their kinetic energy.Thus,they can overcome the electrostatic attraction,that exists between adsorbed molecule and the surface.So,molecules get freed from the surface and physical adsorption goes down.

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