Quiz on Adsorption and Enzyme Kinetics

Adsorption is a process that involves:

• Accumulation of molecules in bulk phase

• Accumulation of molecules on the surface

• Diffusion of molecules into liquid

• Dissolution of molecules in a solvent

Physical adsorption is mainly due to:

• Chemical bond formation

• Van der Waals’ forces

• Covalent bond

• Ionic bond

Which of the following is not a characteristic of chemisorption?

• High enthalpy of adsorption

• Formation of monolayer

• Reversible process

• Involves activation energy

The Freundlich adsorption isotherm is represented by:

• $\frac{x}{m} = kP$

• $\frac{x}{m} = kP^{1/n}$

• $\frac{x}{m} = k \ln P$

• $\frac{x}{m} = \frac{k}{P}$

Langmuir adsorption isotherm assumes:

• Multilayer adsorption

• Homogeneous surface and monolayer adsorption

• Irreversible adsorption

• Infinite number of adsorption sites

Which adsorption isotherm explains multilayer adsorption?

• Langmuir

• Freundlich

• BET

• Temkin

BET theory is used for:

• Surface area determination

• Molecular weight determination

• Heat capacity calculation

• Measuring pH

In physisorption, the extent of adsorption:

• Increases with temperature

• Decreases with temperature

• Independent of temperature

• First increases then decreases

Michaelis-Menten equation describes the relationship between:

• Substrate concentration and enzyme concentration

• Reaction velocity and substrate concentration

• Product concentration and temperature

• Activation energy and rate constant

At very high substrate concentration, the velocity of an enzyme-catalyzed reaction becomes:

• Zero

• Maximum and constant

• Directly proportional to substrate concentration

• Inversely proportional to enzyme concentration