Surface Chemistry
Q. In which of the following processes is adsorption utilized? (2023)
A.
Water purification
B.
Sublimation
C.
Distillation
D.
Filtration
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Solution
Adsorption is widely used in water purification processes to remove impurities.
Correct Answer: A — Water purification
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Q. The Langmuir isotherm assumes that adsorption occurs at specific sites on the surface. What does this imply? (2020)
A.
Adsorption is uniform.
B.
Adsorption is multilayered.
C.
Adsorption is monolayered.
D.
Adsorption is temperature dependent.
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Solution
The Langmuir isotherm assumes that adsorption occurs at specific sites, leading to a monolayer coverage of the adsorbate.
Correct Answer: C — Adsorption is monolayered.
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Q. The Langmuir isotherm assumes that adsorption occurs at specific sites on the surface. What is the maximum coverage called? (2021)
A.
Saturation
B.
Monolayer
C.
Multilayer
D.
Equilibrium
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Solution
In the Langmuir isotherm, the maximum coverage of adsorbate on the adsorbent is referred to as a monolayer.
Correct Answer: B — Monolayer
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Q. What is the effect of increasing temperature on chemisorption? (2022)
A.
Increases adsorption
B.
Decreases adsorption
C.
No effect
D.
Depends on the gas
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Solution
Chemisorption is an exothermic process, and increasing temperature generally decreases the extent of chemisorption.
Correct Answer: B — Decreases adsorption
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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
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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.
Correct Answer: B — Decreases with temperature
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Q. What is the primary factor affecting the rate of adsorption of a gas on a solid surface?
A.
Temperature
B.
Pressure
C.
Surface area
D.
Molecular weight
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Solution
The rate of adsorption increases with the surface area of the solid, as more surface provides more sites for gas molecules to adhere.
Correct Answer: C — Surface area
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Q. What is the primary mechanism of adsorption in activated charcoal?
A.
Chemical bonding
B.
Physical adsorption
C.
Capillary action
D.
Electrostatic attraction
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Solution
Activated charcoal primarily adsorbs substances through physical adsorption due to its high surface area and porous structure.
Correct Answer: B — Physical adsorption
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Q. What is the primary process involved in adsorption? (2023)
A.
Chemical reaction
B.
Physical attraction
C.
Evaporation
D.
Condensation
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Solution
Adsorption primarily involves physical attraction between the adsorbate and the surface of the adsorbent.
Correct Answer: B — Physical attraction
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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
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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.
Correct Answer: D — Van der Waals forces
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Q. What is the term for the energy required to separate an adsorbate from an adsorbent? (2023)
A.
Adsorption energy
B.
Desorption energy
C.
Activation energy
D.
Bond energy
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Solution
Desorption energy is the energy required to separate an adsorbate from an adsorbent.
Correct Answer: B — Desorption energy
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Q. What is the term for the maximum amount of solute that can be adsorbed on a surface? (2021)
A.
Saturation point
B.
Adsorption capacity
C.
Equilibrium constant
D.
Surface tension
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Solution
The maximum amount of solute that can be adsorbed on a surface is referred to as the adsorption capacity.
Correct Answer: B — Adsorption capacity
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Q. What is the term for the process where a solid adsorbs a liquid or gas? (2022)
A.
Absorption
B.
Adsorption
C.
Desorption
D.
Sorption
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Solution
Adsorption is the process where a solid attracts and holds molecules of a liquid or gas on its surface.
Correct Answer: B — Adsorption
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Q. What type of adsorption is characterized by the formation of a chemical bond? (2019)
A.
Physisorption
B.
Chemisorption
C.
Desorption
D.
Multilayer adsorption
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Solution
Chemisorption is characterized by the formation of a chemical bond between the adsorbate and the surface.
Correct Answer: B — Chemisorption
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Q. Which factor does NOT affect the rate of adsorption? (2023)
A.
Temperature
B.
Surface area of adsorbent
C.
Concentration of adsorbate
D.
Color of adsorbent
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Solution
The color of the adsorbent does not affect the rate of adsorption, while temperature, surface area, and concentration do.
Correct Answer: D — Color of adsorbent
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Q. Which of the following is a characteristic of adsorption? (2023)
A.
It is a bulk phenomenon.
B.
It is a surface phenomenon.
C.
It occurs at high temperatures only.
D.
It is always exothermic.
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Solution
Adsorption is a surface phenomenon, as it occurs at the interface between phases.
Correct Answer: B — It is a surface phenomenon.
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Q. Which of the following is an example of physisorption? (2021) 2021
A.
Adsorption of hydrogen on palladium
B.
Adsorption of water on silica gel
C.
Adsorption of oxygen on activated charcoal
D.
Adsorption of ammonia on copper
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Solution
Physisorption involves weak Van der Waals forces, and the adsorption of water on silica gel is a classic example of this type of adsorption.
Correct Answer: B — Adsorption of water on silica gel
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Q. Which of the following statements is true about adsorption? (2023)
A.
It is a bulk phenomenon
B.
It is a surface phenomenon
C.
It occurs only in gases
D.
It is always exothermic
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Solution
Adsorption is a surface phenomenon as it occurs at the interface between phases.
Correct Answer: B — It is a surface phenomenon
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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.
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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.
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