Chapter Exam

Chapter 10: Surface Chemistry — Online MCQ Test

Q: Which of the following is an example of physisorption?

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.

Q: The phenomenon of scattering of light by colloidal particles is called:

Answer: B. Tyndall effect — The Tyndall effect is the scattering of light by colloidal particles, making the path of a beam visible.

Q: A colloidal solution is purified by removing dissolved electrolytes without removing colloidal particles. Which process is used?

Answer: B. Dialysis — Dialysis removes small dissolved ions and molecules through a semipermeable membrane while retaining colloidal particles.

CHEMISTRY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 10: Surface Chemistry with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th CHEMISTRY. 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.

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Chapter 10: Surface Chemistry — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th CHEMISTRY — Chapter 10: Surface Chemistry, with answers and explanations. These are sample questions; the exam has its own separate question set.

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.

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.

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.

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.

A colloidal solution is purified by removing dissolved electrolytes without removing colloidal particles. Which process is used?