Chapter 10: Surface Chemistry — Online MCQ Test
CHEMISTRY · CLASS 12th · Tamil Nadu State Board
Practice Chapter 10: Surface Chemistry with a free chapter-wise online MCQ test.
This chapter covers: This chapter investigates surface phenomena including physisorption chemisorption and catalysis types. Students explore colloid classification preparation methods Emulsion properti....
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 10: Surface Chemistry — Important Questions & Answers
Which of the following is an example of physisorption?
- A. Hydrogen adsorbed on nickel
- B. Nitrogen adsorbed on iron
- C. Water vapour adsorbed on silica gel
- D. Oxygen adsorbed on platinum
Answer: C. Water vapour adsorbed on silica gel
Physisorption involves weak van der Waals forces and is common for gases like water vapour on porous solids such as silica gel.
Physisorption involves weak van der Waals forces and is common for gases like water vapour on porous solids such as silica gel.
The phenomenon of scattering of light by colloidal particles is called:
- A. Brownian movement
- B. Tyndall effect
- C. Electrophoresis
- D. Coagulation
Answer: B. Tyndall effect
The Tyndall effect is the scattering of light by colloidal particles, making the path of a beam visible.
The Tyndall effect is the scattering of light by colloidal particles, making the path of a beam visible.
Why does chemisorption generally increase with rise in temperature initially?
- A. It is always an endothermic process
- B. It requires activation energy to form chemical bonds
- C. It occurs only at very low temperatures
- D. It is independent of surface area
Answer: B. It requires activation energy to form chemical bonds
Chemisorption involves bond formation and usually needs activation energy, so a moderate rise in temperature can help the process.
Chemisorption involves bond formation and usually needs activation energy, so a moderate rise in temperature can help the process.
Which of the following is NOT a property of lyophilic colloids?
- A. Highly stable
- B. Reversible in nature
- C. Readily coagulated by small amount of electrolyte
- D. Strong affinity for dispersion medium
Answer: C. Readily coagulated by small amount of electrolyte
Lyophilic colloids are stable and difficult to coagulate; they do not easily precipitate with small amounts of electrolyte.
Lyophilic colloids are stable and difficult to coagulate; they do not easily precipitate with small amounts of electrolyte.
A colloidal solution is purified by removing dissolved electrolytes without removing colloidal particles. Which process is used?
- A. Coagulation
- B. Dialysis
- C. Electrophoresis
- D. Peptization
Answer: B. Dialysis
Dialysis removes small dissolved ions and molecules through a semipermeable membrane while retaining colloidal particles.
Dialysis removes small dissolved ions and molecules through a semipermeable membrane while retaining colloidal particles.