Quiz for Surface Chemistry

Q1: What is adsorption?

A. Accumulation of molecules on a surface B. Mixing of two liquids C. Formation of a solution D. Reaction in bulk phase

Q2: The process of removing adsorbed particles from a surface is called:

A. Desorption B. Absorption C. Diffusion D. Sublimation

Q3: Which of the following is an example of chemisorption?

A. Hydrogen adsorption on platinum B. Adsorption of nitrogen on charcoal C. Adsorption of water on silica gel D. Adsorption of oxygen on activated charcoal

Q4: Adsorption is generally:

A. Exothermic B. Endothermic C. Isothermal D. Neither

Q5: Which factor does not affect adsorption?

A. Volume of adsorbent B. Surface area C. Temperature D. Nature of adsorbate

Q6: The surface of liquids behaves like:

A. A stretched elastic membrane B. A rigid solid C. A gas D. A plasma

Q7: The unit of surface tension is:

A. N/m B. J C. Pa D. Nm

Q8: Which of the following increases surface tension?

A. Addition of salt to water B. Addition of soap C. Heating water D. Stirring water

Q9: Surfactants are:

A. Surface active agents B. Solvents C. Catalysts D. Inert gases

Q10: Micelles are formed by:

A. Surfactant molecules B. Salt molecules C. Water molecules D. Gas molecules

Q11: The Langmuir adsorption isotherm assumes:

A. Monolayer adsorption B. Multilayer adsorption C. No adsorption D. Physisorption only

Q12: Which type of adsorption is irreversible?

A. Chemisorption B. Physisorption C. Both D. None

Q13: Which of the following is a colloidal system?

A. Milk B. Salt solution C. Sugar solution D. Alcohol

Q14: In coagulation of sols, the stability is:

A. Decreased B. Increased C. Not affected D. Depends on temperature

Q15: Which property is used to measure colloidal particle size?

A. Brownian motion B. Viscosity C. Surface tension D. Conductivity

Q16: The Tyndall effect is the scattering of light by:

A. Colloidal particles B. Solute particles C. Solvent particles D. Gas particles

Q17: Which is used as a stabilizer in colloids?

A. Electrolytes B. Nonelectrolytes C. Bases D. Acids

Q18: Foam is an example of:

A. Gas dispersed in liquid B. Liquid dispersed in gas C. Solid dispersed in gas D. Gas dispersed in solid

Q19: Which of the following is true about physisorption?

A. It is reversible and involves weak van der Waals forces B. It involves chemical bond formation C. It occurs only at high temperature D. It is irreversible

Q20: Which parameter remains constant in the adsorption of gases on solids at constant temperature?

A. Pressure B. Surface area C. Volume D. Amount adsorbed