Adsorption MCQs : This section focuses on the "Adsorption". These Multiple Choice Questions (MCQs) should be practiced to improve the Adsorption skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
A finely divided substance is more effective as an adsorbent.
A. True
B. False
Question 2
In physisorption, the adsorbent does not show specificity towards a particular gas.
A. True
B. False
Question 3
What is the process called when the molecules of a substance are retained at the surface of a solid or a liquid?
A. Absorption
B. Adsorption
C. Sorption
D. Desorption
Question 4
Which of the following forces is involved in physical adsorption?
A. Gravitational force
B. Magnetic force
C. Van der Waals force
D. Electromagnetic force
Question 5
Which of the following is an example of sorption?
A. Sponge in water
B. Cotton dipped in ink
C. Water on silica gel
D. Oxygen on metal surface
Question 6
Which of the following statements is not true with respect to chemisorption?
A. Depends on nature of adsorbate and adsorbent
B. Has a large heat of adsorption
C. Forms a unimolecular layer
D. Occurs at low temperature
Question 7
Which of the following statements is true with respect to the extent of physisorption?
A. Increases with increase in temperature
B. Decreases with increase in surface area
C. Decreases with increase in the strength of Van der Waals forces
D. Decreases with increase in temperature
Question 8
Which of the following statements is true with respect to the types of adsorption?
A. Chemisorption is stronger than physisorption
B. Physisorption is stronger than chemisorption
C. They are both equal
D. They cannot be compared
Question 9
Which of the following statements is incorrect with respect to physisorption?
A. It is reversible
B. It is spontaneous
C. ΔH < 0
D. ΔS > 0
Question 10
Adsorption of methane follows the Langmuir adsorption isotherm at 90K. If p = 1.896cm3g-1bar-1 and b = 0.146bar-1. Calculate the value of θ.
A. 0.116 bar
B. 0.514 bar
C. 0.214 bar
D. 0.216 bar
Question 11
For an adsorbant-adsorbate system obeying the Langmuir adsorption isotherm, b = 0.48 bar-1 and p = 0.16 bar-1. At what pressure will 50% of the surface be covered?
A. 0.05 bar
B. 0.07 bar
C. 0.08 bar
D. 0.04 bar
Question 12
What do you mean by the term “Sorption”?
A. Attachment
B. Detachment
C. Diffusion
D. Thermal Expansion
Question 13
The desorption curve is higher than the adsorption curve.
A. TRUE
B. FALSE
Question 14
Which of the following is not an adsorbent?
A. Carbon
B. Polymers and resins
C. Clay
D. Dry sponge
Question 15
Which of the following is not characteristic of chemisorption?
A. It is irreversible
B. It is specific
C. It is multilayer phenomenon
D. Heat of adsorption is about 400kj
Question 16
Which of the following isotherm is applicable to physical adsorption?
A. Langmuir
B. BET
C. Freundlich
D. Kisluik
Question 17
Which of the following statements regarding the physical adsorption of a gas on surface of solid is not correct?
A. On increasing temperature, adsorption increases continuously
B. Enthalpy changes are negative
C. Adsorption is specific
D. It is reversible in nature