Unit 4: Surface Chemistry — Online MCQ Test
CHEMISTRY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board
Practice Unit 4: Surface Chemistry with a free chapter-wise online MCQ test.
This chapter covers: Focusing on interface phenomena this chapter covers physisorption chemisorption Freundlich adsorption isotherm homogeneous heterogeneous catalysis enzyme kinetics colloids preparat....
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Unit 4: Surface Chemistry — Important Questions & Answers
Which of the following is an example of physisorption?
- A. Adsorption of hydrogen on nickel
- B. Adsorption of nitrogen on charcoal
- C. Oxidation of sulfur dioxide on vanadium pentoxide
- D. Adsorption of oxygen on platinum
Answer: B. Adsorption of nitrogen on charcoal
Physisorption occurs due to weak van der Waals forces, and gases like nitrogen are physically adsorbed on charcoal. Hydrogen on nickel and oxygen on platinum are examples of chemisorption.
Physisorption occurs due to weak van der Waals forces, and gases like nitrogen are physically adsorbed on charcoal. Hydrogen on nickel and oxygen on platinum are examples of chemisorption.
The Freundlich adsorption isotherm is represented by which of the following equations?
- A. x/m = kP
- B. x/m = kP^(1/n)
- C. PV = nRT
- D. K = [A][B]/[C][D]
Answer: B. x/m = kP^(1/n)
According to Freundlich adsorption isotherm, the amount adsorbed per unit mass of adsorbent is proportional to pressure raised to a power. The equation is x/m = kP^(1/n).
According to Freundlich adsorption isotherm, the amount adsorbed per unit mass of adsorbent is proportional to pressure raised to a power. The equation is x/m = kP^(1/n).
Adsorption generally decreases with increase in temperature because:
- A. Adsorption is always endothermic
- B. Adsorption is usually exothermic
- C. Higher temperature increases surface area
- D. Adsorbate becomes heavier
Answer: B. Adsorption is usually exothermic
Adsorption usually releases heat, so it is an exothermic process. Increasing temperature shifts the equilibrium toward desorption, reducing adsorption.
Adsorption usually releases heat, so it is an exothermic process. Increasing temperature shifts the equilibrium toward desorption, reducing adsorption.
The adsorption of a gas on a solid surface is found to increase sharply at low pressure and then gradually reach a maximum. This behavior is best described by:
- A. Henry's law only
- B. Freundlich adsorption isotherm
- C. Avogadro's law
- D. Raoult's law
Answer: B. Freundlich adsorption isotherm
Freundlich adsorption isotherm explains the increase in adsorption with pressure and the tendency to approach saturation at higher pressure. It fits experimental adsorption data well over a limited range.
Freundlich adsorption isotherm explains the increase in adsorption with pressure and the tendency to approach saturation at higher pressure. It fits experimental adsorption data well over a limited range.
Which of the following statements is correct regarding emulsions?
- A. In oil-in-water emulsion, water is the dispersed phase
- B. In water-in-oil emulsion, oil is the dispersed phase
- C. In oil-in-water emulsion, oil is the dispersed phase
- D. Both phases are always equally dispersed
Answer: C. In oil-in-water emulsion, oil is the dispersed phase
In an oil-in-water emulsion, oil is the dispersed phase and water is the dispersion medium. This distinction is commonly tested in board exams.
In an oil-in-water emulsion, oil is the dispersed phase and water is the dispersion medium. This distinction is commonly tested in board exams.