Q. What is the effect of temperature on chemisorption? (2023)
A.Increases with temperature
B.Decreases with temperature
C.Remains constant
D.Depends on the gas
Solution
Chemisorption typically decreases with an increase in temperature because it involves the formation of stronger chemical bonds, which are less favorable at higher thermal energies.
Q. What is the effect of temperature on chemisorption? (2023) 2023
A.Increases with temperature
B.Decreases with temperature
C.Remains constant
D.Depends on the gas
Solution
Chemisorption typically decreases with an increase in temperature because it involves the formation of stronger chemical bonds, which are less favorable at higher thermal energies.
Q. What is the primary process involved in the adsorption of gases on solid surfaces? (2022) 2022
A.Diffusion
B.Condensation
C.Chemical reaction
D.Van der Waals forces
Solution
Adsorption of gases on solid surfaces primarily occurs due to Van der Waals forces, which are weak intermolecular forces that allow gas molecules to adhere to the surface.
Q. Which of the following methods is used to purify colloidal solutions? (2020)
A.Filtration
B.Centrifugation
C.Dialysis
D.Evaporation
Solution
Dialysis is used to purify colloidal solutions by allowing the solvent and small solutes to pass through a semi-permeable membrane while retaining the colloidal particles.
Q. Which of the following statements is true regarding the Freundlich adsorption isotherm? (2020)
A.It applies only to monolayer adsorption.
B.It is applicable to heterogeneous surfaces.
C.It predicts a constant adsorption capacity.
D.It is a linear relationship.
Solution
The Freundlich adsorption isotherm is applicable to heterogeneous surfaces and describes how adsorption varies with pressure or concentration, indicating that it is not limited to monolayer adsorption.
Correct Answer: B — It is applicable to heterogeneous surfaces.
Q. Which of the following statements is true regarding the Freundlich adsorption isotherm? (2020) 2020
A.It is applicable to monolayer adsorption.
B.It assumes a uniform surface.
C.It is a linear relationship.
D.It describes heterogeneous adsorption.
Solution
The Freundlich adsorption isotherm describes heterogeneous adsorption on surfaces with varying affinities, making it suitable for real-world applications.
Correct Answer: D — It describes heterogeneous adsorption.