Q. Which of the following factors does NOT affect the rate of adsorption?
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A.
Surface area of adsorbent
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B.
Temperature
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C.
Pressure of gas
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D.
Color of adsorbent
Solution
The color of the adsorbent does not affect the rate of adsorption.
Correct Answer: D — Color of adsorbent
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Q. Which of the following is a characteristic of adsorption isotherms?
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A.
They describe the relationship between pressure and volume.
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B.
They describe the relationship between concentration and temperature.
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C.
They describe the relationship between the amount of adsorbate and pressure at constant temperature.
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D.
They describe the relationship between the amount of adsorbate and the surface area.
Solution
Adsorption isotherms describe the relationship between the amount of adsorbate and pressure at constant temperature.
Correct Answer: C — They describe the relationship between the amount of adsorbate and pressure at constant temperature.
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Q. Which of the following is a characteristic of chemisorption?
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A.
Reversible process
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B.
Low heat of adsorption
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C.
Specificity to adsorbate
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D.
Occurs at low temperatures
Solution
Chemisorption is characterized by its specificity to adsorbate due to the formation of chemical bonds.
Correct Answer: C — Specificity to adsorbate
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Q. Which of the following is a common application of adsorption?
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A.
Catalysis
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B.
Separation of gases
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C.
Water purification
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D.
All of the above
Solution
Adsorption is widely used in catalysis, gas separation, and water purification processes.
Correct Answer: D — All of the above
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Q. Which of the following is a common method to measure the surface area of adsorbents?
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A.
TGA
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B.
BET method
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C.
XRD
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D.
FTIR
Solution
The BET method (Brunauer-Emmett-Teller) is commonly used to measure the surface area of adsorbents.
Correct Answer: B — BET method
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Q. Which of the following is a common method to measure the surface area of an adsorbent?
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A.
TGA
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B.
BET method
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C.
XRD
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D.
FTIR
Solution
The BET method (Brunauer-Emmett-Teller) is commonly used to measure the surface area of adsorbents.
Correct Answer: B — BET method
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Q. Which of the following is an example of a physical adsorption?
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A.
Adsorption of O2 on activated charcoal
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B.
Adsorption of H2 on palladium
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C.
Adsorption of NH3 on silica gel
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D.
Adsorption of CO on metals
Solution
The adsorption of O2 on activated charcoal is an example of physical adsorption.
Correct Answer: A — Adsorption of O2 on activated charcoal
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Q. Which of the following is an example of physisorption?
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A.
Adsorption of hydrogen on palladium
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B.
Adsorption of water on silica gel
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C.
Adsorption of oxygen on activated charcoal
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D.
Adsorption of ammonia on copper
Solution
Physisorption involves weak van der Waals forces, and the adsorption of oxygen on activated charcoal is a classic example.
Correct Answer: C — Adsorption of oxygen on activated charcoal
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Q. Which of the following is NOT a characteristic of adsorption?
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A.
It is a surface phenomenon.
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B.
It is a bulk phenomenon.
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C.
It is exothermic in nature.
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D.
It reaches equilibrium.
Solution
Adsorption is a surface phenomenon, while absorption is a bulk phenomenon.
Correct Answer: B — It is a bulk phenomenon.
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Q. Which of the following is NOT a characteristic of chemisorption?
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A.
Reversible
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B.
High heat of adsorption
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C.
Specificity
-
D.
Monolayer formation
Solution
Chemisorption is typically irreversible, unlike physisorption which is reversible.
Correct Answer: A — Reversible
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Q. Which of the following is NOT a method to increase the rate of adsorption?
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A.
Increasing temperature
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B.
Increasing surface area
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C.
Increasing pressure
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D.
Decreasing particle size
Solution
Increasing temperature generally decreases the rate of adsorption for exothermic processes, while the other options increase the rate.
Correct Answer: A — Increasing temperature
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Q. Which of the following is NOT a type of adsorption isotherm?
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A.
Langmuir
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B.
Freundlich
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C.
BET
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D.
Henry
Solution
Henry's law describes solubility, not adsorption, while Langmuir, Freundlich, and BET are types of adsorption isotherms.
Correct Answer: D — Henry
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Q. Which of the following is true about the Freundlich adsorption isotherm?
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A.
It applies only to monolayer adsorption
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B.
It is applicable to heterogeneous surfaces
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C.
It assumes a fixed number of adsorption sites
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D.
It is a linear isotherm
Solution
The Freundlich adsorption isotherm is applicable to heterogeneous surfaces and describes multilayer adsorption.
Correct Answer: B — It is applicable to heterogeneous surfaces
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Q. Which of the following statements is true regarding adsorption?
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A.
Adsorption is always an exothermic process
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B.
Adsorption increases with increasing temperature
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C.
Adsorption is a bulk phenomenon
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D.
Adsorption does not depend on surface area
Solution
Adsorption is generally an exothermic process, as it releases energy.
Correct Answer: A — Adsorption is always an exothermic process
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Q. Which of the following statements is true regarding chemisorption?
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A.
It is a reversible process.
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B.
It involves the formation of a chemical bond.
-
C.
It occurs at low temperatures.
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D.
It is independent of surface area.
Solution
Chemisorption involves the formation of a chemical bond and is generally an irreversible process.
Correct Answer: B — It involves the formation of a chemical bond.
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Q. Which of the following statements is true regarding the Langmuir adsorption isotherm?
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A.
It assumes a monolayer adsorption.
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B.
It applies to multilayer adsorption.
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C.
It is temperature independent.
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D.
It is only applicable to gases.
Solution
The Langmuir adsorption isotherm assumes that adsorption occurs in a monolayer on a surface with a finite number of identical sites.
Correct Answer: A — It assumes a monolayer adsorption.
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