Adsorption Isotherm MCQs | Chemistry

By: Prof. Dr. Fazal Rehman | Last updated: November 23, 2024

1. The surface area that is occupied by a single gas molecule is inversely proportional to which of the following?
(A) Molar mass of the gas adsorbed
(B) All of the mentioned
(C) Volume of the gas
(D) Density of the liquefied gas
(E) None of these
Answer: D

2. Which of the following is the total surface area that is covered by all the molecules of the adsorbed gas?
(A) S = nβ/NA
(B) S = βNA/n
(C) S = nβNA
(D) S = NA/nβ
(E) None of these
Answer: A

3. When was the B.E.T. theory proposed?
(A) 1940
(B) 1935
(C) 1945
(D) 1938
(E) None of these
Answer: D

4. An assumption for B.E.T. theory is __________
(A) All of the mentioned
(B) The adsorption at one site never affects the adsorption at the neighbouring site
(C) Physical adsorption of adsorbate is always occurred resulting in the formation of the multilayers
(D) Solid surface possesses uniform, localised sites
(E) None of these
Answer: A

5. Which of the following is the energy of adsorption in the first layer?
(A) Increasing
(B) Constant
(C) Decreasing
(D) None of the mentioned
(E) None of these
Answer: A

6. The B.E.T. theory was based on which of the following?
(A) Multilayer adsorption
(B) Single layer adsorption
(C) Double layer adsorption
(D) None of the mentioned
(E) None of these
Answer: A

7. According to the B.E.T. equation, what will the plot of P/V(P0-P) versus P/P0 yield?
(A) Hyperbola
(B) Parabola
(C) Straight line
(D) Eclipse
(E) None of these
Answer: C

8. The surface area available for the nth layer is equal to the coverage of which of the following layer?
(A) nth layer
(B) (n+1)th layer
(C) (n-1)th layer
(D) None of the mentioned
(E) None of these
Answer: C

9. In the B.E.T. equation, the P0 denotes _____________
(A) The Saturated vapor pressure of gas molecules
(B) The Unsaturated vapor pressure of gas molecules
(C) Pressure of the gas molecules
(D) All of the mentioned
(E) None of these
Answer: D

10. The B.E.T. theory is used in calculating which of the following?
(A) Surface area of adsorbate
(B) Surface area of adsorbents and catalyst
(C) Surface area of adsorbent only
(D) None of the mentioned
(E) None of these
Answer: B

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