Quiz for Adsorption

Q1: Which of the following is an example of physical adsorption?

A. Hydrogen on glass B. NH₃ on charcoal C. N₂ on tungsten D. CO on nickel

Q2: Adsorption is a ____ process.

A. Endothermic B. Isobaric C. Exothermic D. Isothermal

Q3: Which type of adsorption involves chemical bond formation?

A. Physisorption B. Chemisorption C. Molecular adsorption D. None

Q4: In Freundlich isotherm, 1/n = 1 means:

A. Adsorption is irreversible B. Adsorption is linear C. No adsorption D. Adsorption is infinite

Q5: Langmuir isotherm assumes:

A. Multilayer adsorption B. Variable surface C. Monolayer adsorption D. Strong interactions between adsorbed molecules

Q6: Which gas is adsorbed more readily?

A. He B. O₂ C. NH₃ D. H₂

Q7: Temperature effect on physisorption is:

A. Increases with temperature B. No effect C. Decreases with temperature D. Unpredictable

Q8: Which statement is true?

A. Adsorption is bulk phenomenon B. Adsorption occurs on surface C. Adsorption involves endothermic process D. None

Q9: Desorption is the process of:

A. Increasing adsorption B. Removing adsorbed substance C. Forming a layer D. Cooling adsorbent

Q10: Which is not a characteristic of chemisorption?

A. High specificity B. Irreversible C. Occurs at low temperature D. Involves activation energy

Q11: Which one shows multilayer adsorption?

A. Langmuir B. Freundlich C. BET D. None

Q12: Which type of adsorption has enthalpy change ~ -20 kJ/mol?

A. Physisorption B. Chemisorption C. Both D. None

Q13: Enthalpy of chemisorption is about:

A. −20 kJ/mol B. −40 kJ/mol C. −80 to −240 kJ/mol D. Positive

Q14: Extent of adsorption is directly proportional to:

A. Temperature B. Surface area C. Molecular mass D. Volume

Q15: Activated charcoal is used to adsorb:

A. Water B. Hydrogen C. Carbon dioxide D. Toxic gases

Q16: A catalyst works due to its:

A. Bulk properties B. Surface area C. Density D. Color

Q17: Which is a correct match?

A. Langmuir – multilayer B. Freundlich – irreversible C. BET – multilayer D. Langmuir – reversible only

Q18: In adsorption, the substance adsorbed is called:

A. Adsorbate B. Adsorbent C. Solute D. Solvent

Q19: Which is correct about adsorption?

A. Occurs only in liquids B. Exothermic C. Always endothermic D. Decreases with pressure