Class 12 Surface Chemistry MCQs with answers, Surface chemistry deals with phenomena that occur at the surfaces or interfaces. The interface or surface is represented by separating the bulk phases by a hyphen or a slash. For example, the interface between a solid and a gas may be represented by solid gas or solid/gas. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 12 chemistry syllabus. By practicing these Class 12 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Annual examinations.

Class 12 Chemistry Chapter Surface Chemistry MCQs with answers

Q1. An emulsion cannot be broken by _ and __.

1. Heating.
2. Adding more amount of dispersion medium.
3. Freezing.
4. Adding emulsifying agent.

Q2. Which of the following substances will precipitate the negatively charged emulsions?

1. KCl.
2. Glucose.
3. Urea.
4. NaCl.

Q3. Which of the following is not a favourable condition for physical adsorption?

1. High pressure.
2. Negative HClick To View The Answer
3. Higher critical temperature of adsorbate.
4. High temperature.

Q4. Freshly prepared precipitate sometimes gets converted to colloidal solution by _.

1. Coagulation.
2. Electrolysis.
3. Diffusion.
4. Peptisation.

Q5. Which of the following colloids cannot be coagulated easily?

1. Lyophobic colloids.
2. Irreversible colloids.
3. Reversible colloids.
4. Lyophilic colloids.

Q6. The values of colligative properties of colloidal solution are of small order in comparison to those shown by true
solutions of same concentration because of colloidal particles ______.

1. Exhibit enormous surface area.
2. Remain suspended in the dispersion medium.
3. Form lyophilic colloids.
4. Are comparatively less in number

Q7. Which of the following process is not responsible for the presence of electric charge on the sol particles?

1. Electron capture by sol particles.
2. Adsorption of ionic species from solution.
3. Formation of Helmholtz electrical double layer.
4. Absorption of ionic species from solution.

Q8. Extent of physisorption of a gas increases with _.

1. Increase in temperature.
2. Decrease in temperature.
3. Decrease in surface area of adsorbent.
4. Decrease in strength of van der Waals forces.

Q9. In physisorption adsorbent does not show specificity for any particular gas because __.

1. Involved van der Waals forces are universal.
2. Gases involved behave like ideal gases.
3. Enthalpy of adsorption is low.
4. It is a reversible process.

Q10. H₂ gas is adsorbed on activated charcoal to a very little extent in comparison to easily liquefiable gases due to
__.

1. Very strong van der Waal’s interaction.
2. Very weak van der Waals forces.
3. Very low critical temperature.
4. Very high critical temperature

Q11. Which of the following process is responsible for the formation of delta at a place where rivers meet the sea?

1. Emulsification.
2. Colloid formation.
3. Coagulation.
4. Peptisation.

Q12. Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is
prevented?

1. Reverse osmosis takes place.
2. Electroosmosis takes place.
3. Dispersion medium begins to move.
4. Dispersion medium becomes stationary.

Q13. A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified
as __.

1. Solid sol.
2. Gel.
3. Emulsion.
4. Sol.

Q14. Hardening of leather in tanning industry is based on:

1. Electrophoresis.
2. Electro-osmosis.
3. Mutual coagulation.
4. Tyndall effect.

Q15. What happens when a lyophilic sol is added to a lyophobic sol?

1. Lyophobic sol is protected.
2. Lyophilic sol is protected.
3. Film of lyophilic sol is formed over lyophobic sol.
4. Film of lyophobic sol is formed over lyophilic sol.

Q16. Which of the following process does not occur at the interface of phases?

1. Crystallisation.
2. Heterogenous catalysis.
3. Homogeneous catalysis.
4. Corrosion.

Q17. Method by which lyophobic sol can be protected.

1. By addition of oppositely charged sol.
2. By addition of an electrolyte.
3. By addition of lyophilic sol.
4. By boiling.

Q18. At high concentration of soap in water, soap behaves as __.

1. Molecular colloid
2. Associated colloid
3. Macromolecular colloid
4. Lyophilic colloid

Q19. Which of the following statements are correct?

1. Mixing two oppositely charged sols neutralises their charges and stabilises the colloid.
2. Presence of equal and similar charges on colloidal particles provides stability to the colloids.
3. Any amount of dispersed liquid can be added to emulsion without destabilising it.
4. Brownian movement stabilises sols.

Q20. Which of the following options are correct?

1. Micelle formation by soap in aqueous solution is possible at all temperatures.
2. Micelle formation by soap in aqueous solution occurs above a particular concentration.
3. On dilution of soap solution micelles may revert to individual ions.
4. Soap solution behaves as a normal strong electrolyte at all concentrations.

Q21. The term ‘sorption’ stands for __.

1. Absorption
2. Adsorption
3. Both absorption and adsorption
4. Desorption