Q. What is the effect of temperature on chemisorption? (2023)
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Depends on the gas
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.
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
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.
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
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.
Q. Which of the following methods is used to purify colloidal solutions? (2020)
A.
Filtration
B.
Centrifugation
C.
Dialysis
D.
Evaporation
Solution
Dialysis is used to purify colloidal solutions by allowing the solvent and small solutes to pass through a semi-permeable membrane while retaining the colloidal particles.
Q. Which of the following statements is true regarding adsorption isotherms? (2020)
A.
They describe the relationship between pressure and volume.
B.
They describe the relationship between temperature and solubility.
C.
They describe the relationship between the amount of adsorbate and its pressure at constant temperature.
D.
They describe the relationship between the surface area and the mass of adsorbent.
Solution
Adsorption isotherms describe the relationship between the amount of adsorbate on the adsorbent and its pressure at a constant temperature, illustrating how adsorption varies with pressure.
Correct Answer:
C
— They describe the relationship between the amount of adsorbate and its pressure at constant temperature.
Q. Which of the following statements is true regarding the Freundlich adsorption isotherm? (2020)
A.
It applies only to monolayer adsorption.
B.
It is applicable to heterogeneous surfaces.
C.
It predicts a constant adsorption capacity.
D.
It is a linear relationship.
Solution
The Freundlich adsorption isotherm is applicable to heterogeneous surfaces and describes how adsorption varies with pressure or concentration, indicating that it is not limited to monolayer adsorption.
Correct Answer:
B
— It is applicable to heterogeneous surfaces.
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.
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.
Surface Chemistry is a crucial topic in the study of chemistry, especially for students preparing for school and competitive exams. Understanding the principles of surface chemistry can significantly enhance your performance in exams. Practicing MCQs and objective questions on this topic not only helps in reinforcing your concepts but also boosts your confidence in tackling important questions during your exam preparation.
What You Will Practise Here
Fundamentals of adsorption and desorption processes
Types of adsorption: physisorption and chemisorption
Langmuir and Freundlich adsorption isotherms
Applications of surface chemistry in catalysis
Surface tension and its measurement
Colloids and their properties
Important definitions and formulas related to surface chemistry
Exam Relevance
Surface Chemistry is a significant part of the syllabus for CBSE, State Boards, NEET, and JEE. Questions from this topic often appear in various formats, including direct MCQs, numerical problems, and conceptual questions. Familiarity with common patterns, such as the application of adsorption isotherms or the calculation of surface tension, can be beneficial for students aiming for high scores in their exams.
Common Mistakes Students Make
Confusing physisorption with chemisorption and their characteristics
Misunderstanding the implications of different adsorption isotherms
Overlooking the significance of surface area in catalytic processes
Neglecting the role of temperature and pressure in adsorption phenomena
FAQs
Question: What are the key differences between physisorption and chemisorption? Answer: Physisorption involves weak van der Waals forces and is reversible, while chemisorption involves strong chemical bonds and is usually irreversible.
Question: How can I calculate the surface area of an adsorbent? Answer: The surface area can be calculated using the BET equation, which relates the amount of gas adsorbed to the surface area of the adsorbent.
Now is the time to enhance your understanding of Surface Chemistry! Dive into our practice MCQs and test your knowledge to excel in your upcoming exams. Remember, consistent practice is the key to success!
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