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Question: Which of the following statement(s) is/are correct related with surface phenomenon ?...

Which of the following statement(s) is/are correct related with surface phenomenon ?

A

The extent of chemisorption decreases with the increase in temperature at constant pressure.

B

Solid catalyst catalyses gaseous reaction by chemisorption of reactant molecules.

C

In adsorption entropy of system decreases.

D

Extent of adsorption of gases on charcoal increases with increase in pressure of the gas

Answer

All statements (A), (B), (C), and (D) are correct.

Explanation

Solution

  1. Chemisorption: Chemisorption is exothermic, so an increase in temperature favors desorption. Hence, the extent of chemisorption decreases with rising temperature.

  2. Heterogeneous Catalysis: Heterogeneous catalysis often occurs by the chemisorption of reacting gas molecules on the surface of a solid catalyst.

  3. Entropy in Adsorption: Adsorption leads to a decrease in randomness (entropy) as the adsorbed molecules are fixed to the surface.

  4. Adsorption Isotherms: According to adsorption isotherms, the adsorption of gases (like on charcoal) increases with an increase in the pressure.