Surface Chemistry

Q. In the context of adsorption, what does the term 'saturation' refer to?
  • A. Complete coverage of the adsorbent surface
  • B. Maximum temperature for adsorption
  • C. Equilibrium state of adsorption and desorption
  • D. None of the above
Q. In the Freundlich adsorption isotherm, which parameter indicates the extent of adsorption?
  • A. K
  • B. n
  • C. P
  • D. T
Q. In the Langmuir adsorption isotherm, what assumption is made about the adsorption sites?
  • A. They are identical and have the same energy
  • B. They are different and have varying energy
  • C. They can accommodate multiple layers
  • D. They are not limited in number
Q. In the Langmuir adsorption isotherm, what does the term 'b' represent?
  • A. Adsorption energy
  • B. Surface area
  • C. Equilibrium constant
  • D. Adsorption capacity
Q. The Freundlich adsorption isotherm is applicable to which type of adsorption?
  • A. Physisorption only
  • B. Chemisorption only
  • C. Both physisorption and chemisorption
  • D. None of the above
Q. The Langmuir adsorption isotherm assumes that:
  • A. Adsorption occurs on a surface with infinite sites
  • B. Adsorption sites are equivalent
  • C. Adsorption is a multilayer process
  • D. Adsorption is independent of pressure
Q. The Langmuir adsorption isotherm assumes which of the following?
  • A. Adsorption occurs on a surface with infinite sites
  • B. Adsorption sites are equivalent
  • C. Adsorption is a multilayer process
  • D. Adsorption is temperature independent
Q. What is the effect of increasing temperature on physisorption?
  • A. Increases adsorption
  • B. Decreases adsorption
  • C. No effect
  • D. Depends on the adsorbate
Q. What is the main characteristic of a catalyst in surface chemistry?
  • A. It increases the rate of reaction by changing the equilibrium.
  • B. It is consumed in the reaction.
  • C. It provides an alternative reaction pathway.
  • D. It decreases the activation energy of the reaction.
Q. What is the main characteristic of a catalyst in surface reactions?
  • A. It is consumed in the reaction.
  • B. It lowers the activation energy.
  • C. It increases the temperature of the reaction.
  • D. It changes the equilibrium constant.
Q. What is the main difference between adsorption and absorption?
  • A. Adsorption involves a surface phenomenon
  • B. Absorption is a surface phenomenon
  • C. Both are the same
  • D. Adsorption is faster than absorption
Q. What is the main difference between physisorption and chemisorption?
  • A. Temperature dependence
  • B. Nature of forces involved
  • C. Reversibility
  • D. All of the above
Q. What is the primary driving force for adsorption in physisorption?
  • A. Chemical bonds
  • B. Van der Waals forces
  • C. Hydrogen bonds
  • D. Ionic interactions
Q. What is the primary factor that affects the rate of adsorption of a gas on a solid surface?
  • A. Temperature
  • B. Pressure
  • C. Surface area of the adsorbent
  • D. Nature of the gas
Q. What is the primary mechanism of adsorption in physisorption?
  • A. Chemical bonding
  • B. Van der Waals forces
  • C. Hydrogen bonding
  • D. Ionic bonding
Q. What is the primary process involved in the adsorption of gases on solid surfaces?
  • A. Diffusion
  • B. Condensation
  • C. Chemical reaction
  • D. Van der Waals forces
Q. What is the role of activated charcoal in adsorption processes?
  • A. Catalyst
  • B. Adsorbent
  • C. Solvent
  • D. Reagent
Q. What is the significance of the BET theory in surface chemistry?
  • A. Describes physisorption
  • B. Describes chemisorption
  • C. Determines surface area of solids
  • D. Calculates adsorption energy
Q. What is the term for the process of removing adsorbed molecules from a surface?
  • A. Absorption
  • B. Desorption
  • C. Sorption
  • D. Adsorption
Q. What is the term for the process where a gas or liquid forms a thin layer on a solid surface?
  • A. Absorption
  • B. Desorption
  • C. Adsorption
  • D. Sorption
Q. What is the term used for the amount of solute that can be adsorbed per unit mass of adsorbent?
  • A. Adsorption isotherm
  • B. Adsorption capacity
  • C. Adsorption efficiency
  • D. Adsorption rate
Q. What type of adsorption occurs when the adsorbate forms strong chemical bonds with the adsorbent?
  • A. Physisorption
  • B. Chemisorption
  • C. Desorption
  • D. Sorption
Q. What type of isotherm is represented by the Freundlich equation?
  • A. Langmuir isotherm
  • B. BET isotherm
  • C. Freundlich isotherm
  • D. Temkin isotherm
Q. Which is the correct order of adsorption strength from highest to lowest?
  • A. Physisorption > Chemisorption
  • B. Chemisorption > Physisorption
  • C. Physisorption = Chemisorption
  • D. None of the above
Q. Which of the following factors does NOT affect the adsorption capacity of a solid?
  • A. Surface area
  • B. Temperature
  • C. Nature of the adsorbate
  • D. Color of the adsorbent
Q. Which of the following factors does NOT affect the adsorption of a gas on a solid?
  • A. Temperature
  • B. Pressure
  • C. Surface area of the solid
  • D. Color of the solid
Q. Which of the following factors does NOT affect the adsorption of gases on solids?
  • A. Temperature
  • B. Pressure
  • C. Surface area of adsorbent
  • D. Color of the adsorbent
Q. Which of the following factors does NOT affect the adsorption process?
  • A. Temperature
  • B. Surface area of adsorbent
  • C. Nature of adsorbate
  • D. Color of adsorbent
Q. Which of the following factors does NOT affect the rate of adsorption?
  • A. Surface area of adsorbent
  • B. Temperature
  • C. Pressure of gas
  • D. Color of adsorbent
Q. Which of the following is a characteristic of adsorption isotherms?
  • A. They describe the relationship between pressure and volume.
  • B. They describe the relationship between concentration and temperature.
  • C. They describe the relationship between the amount of adsorbate and pressure at constant temperature.
  • D. They describe the relationship between the amount of adsorbate and the surface area.
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