Quiz on Adsorption and Isotherms

What is the process of adsorption?

• The process of dissolving substances in a liquid

• The attachment of molecules, atoms, or ions to a surface

• The transfer of heat between two surfaces

• The bulk movement of molecules into a material

Which of the following best describes physisorption?

• It involves the formation of strong covalent bonds

• It involves weak, non-covalent interactions

• It occurs only at high temperatures

• It leads to the permanent attachment of adsorbate to the adsorbent

Which isotherm assumes monolayer adsorption on a homogeneous surface?

• Langmuir Isotherm

• Freundlich Isotherm

• BET Isotherm

• IUPAC Type II Isotherm

In the Langmuir isotherm, the extent of adsorption (θ) at high pressure approaches:

• 0

• 1

• A value greater than 1

• Undefined

The BET isotherm is primarily used to:

• Measure the polarity of adsorbates

• Determine the surface area of solids

• Analyze chemical reactivity

• Study multilayer adsorption in liquids

Which adsorption isotherm exhibits hysteresis loops?

• Langmuir Isotherm

• BET Isotherm

• Freundlich Isotherm

• IUPAC Type I Isotherm

What does hysteresis in adsorption isotherms indicate?

• Capillary condensation in pores

• Molecular reactivity increase

• Lack of adsorption

• Surface deactivation

Langmuir isotherm assumes that:

• Adsorption occurs on multilayers

• Adsorption sites are equivalent

• Adsorbate molecules interact strongly

• Adsorption is independent of pressure

Which stage in adsorption involves molecules detaching from the surface to free active sites?

• Diffusion

• Surface reaction

• Desorption

• Adsorption

Which adsorption model explains stepwise multilayer adsorption?

• Langmuir Isotherm

• Freundlich Isotherm

• BET Isotherm

• IUPAC Type VI