This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part I > Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Cooloidal solutions are not classified on the basis of: A) Molecular size. B) Nature of the particles. C) Surface tension value. D) Interaction between dispersed phase and dispersion medium. Show Answer Correct Answer: C) Surface tension value. 2. When the concentration of adsorbate is more on the surface than the bulk of the adsorbent it is called as A) Positive adsorption. B) Negative absorption. C) Positive absorption. D) Negative adsorption. Show Answer Correct Answer: A) Positive adsorption. 3. Which can be used as an adsorbent for removal of moisture and controlling humidity in room? A) Silica. B) Silicon. C) Clay. D) Ceramic. Show Answer Correct Answer: A) Silica. 4. The catalyst used in the hydrogenation of oil is A) Ni. B) Pt. C) Fe. D) V$_{2}$O$_{5}$. Show Answer Correct Answer: A) Ni. 5. Examples of lyophobic Sol? A) Cellulose. B) Gelatine. C) Gold sol. D) Protein. Show Answer Correct Answer: C) Gold sol. 6. Select the CORRECT property of a lyophobic sol. A) The colloidal particles are not easily detected by the ultra microscope. B) The surface tension of dispersed phase is generally lower than that of the dispersion medium. C) The viscosity of a sol is similar to that of the dispersion medium (solvent). D) Addition of low concentration of electrolytes has little effect on the coagulation. Show Answer Correct Answer: C) The viscosity of a sol is similar to that of the dispersion medium (solvent). 7. The formation of micelles takes place only above a particular temperature known as A) Craft temperature. B) Kraft temperature. C) Both. D) None of the above. Show Answer Correct Answer: B) Kraft temperature. 8. In EDTA method buffer is used A) To indicate the colour changes. B) To maintain the pH. C) To remove scale. D) To absorb impuritie. Show Answer Correct Answer: B) To maintain the pH. 9. Potential difference between Stern layer and Diffuse layer A) Zeta potential. B) Helmholtz electrical double layer. C) Electric Double layer. D) Bulk layer. Show Answer Correct Answer: A) Zeta potential. 10. Which law the following relation describesPV= a constant A) Charles's law. B) Boyle's law. C) Both the above. D) Avogadro's law. Show Answer Correct Answer: B) Boyle's law. 11. The depth of the color of the solution of methylene blue when treated with finely divided charcoal appreciably. A) No change. B) Decreases. C) Increases. D) May increases of may not increase. Show Answer Correct Answer: B) Decreases. 12. 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 ..... A) Form lyophilic colloids. B) Exhibit enormous surface area. C) Are comparatively less in number. D) Remain suspended in the dispersion medium. Show Answer Correct Answer: C) Are comparatively less in number. 13. A stable mixture of two or more liquids e.g. icecream A) Emulsion. B) Solution. C) Insoluble. D) Mixture. Show Answer Correct Answer: A) Emulsion. 14. Adsorption is an ..... phenomenon A) Bulk. B) Surface. C) Both. D) None of these. Show Answer Correct Answer: B) Surface. 15. Corrosion in metal is A) Desorption. B) Adsorption. C) Sorption. D) Absorption. Show Answer Correct Answer: B) Adsorption. 16. '' A substance is first ground to coarse particles and then mixed with the dispersion medium to produce a suspension."Name the method to produce sol as mentioned above. A) Peptization. B) Double decomposition. C) Mechanical dispersion. D) Bredig's arc. Show Answer Correct Answer: C) Mechanical dispersion. 17. Which of the following is not a multimolecular colloids A) Egg albumin. B) Gold sol. C) Fe(OH)$_{3}$ sol. D) Sulphur sol. Show Answer Correct Answer: A) Egg albumin. 18. Select the CORRECT statement regarding adsorption process. A) A substance is encapsulated in the solid or liquid form. B) It may involve chemisorption only. C) A substance is distributed throughout the solid or liquid form. D) A substance becomes attached to the surface of a solid or a liquid. Show Answer Correct Answer: D) A substance becomes attached to the surface of a solid or a liquid. 19. Only allow electrolytes to pass through under the influence of pressure or suction pump. A) Dialysis. B) Ultracentrifugation. C) Ultrafiltration. D) None of the above. Show Answer Correct Answer: C) Ultrafiltration. 20. In physisorption adsorbent does not show specificity for any particular gas because ..... A) Enthalpy of adsorption is low. B) Gases involved behave like ideal gases. C) Involved van der Waals forces are universal. D) It is a reversible process. Show Answer Correct Answer: C) Involved van der Waals forces are universal. 21. At high concentration of soap in water, soap behaves as A) Solution. B) Multimolecular colloid. C) Associated colloid. D) Macromolecular colloid. Show Answer Correct Answer: C) Associated colloid. 22. Freshly prepared precipitate sometimes gets converted to colloidal solution by ..... A) Coagulation. B) Diffusion. C) Electrolysis. D) Peptisation. Show Answer Correct Answer: D) Peptisation. 23. Process of converting a freshly prepared precipitate into colloidal particles by shaking it with the dispersion medium in the presence of a small amount of a suitable electrolyte is called A) Peptization. B) Coagulation. C) Both. D) None of the above. Show Answer Correct Answer: A) Peptization. 24. A colloidal system having a solid substance as a dispersed phrase and a liquid as a dispersion medium is classified as A) Sol. B) Gel. C) Emulsion. D) Solid sol. Show Answer Correct Answer: A) Sol. 25. Dalton's Law is applicable for A) Reacting gases. B) Air. C) Non reacting gases. D) Any gas. Show Answer Correct Answer: C) Non reacting gases. 26. It has been observed that ..... gases are more adsorbed than ..... gas. A) Easily liquefiable gas, permanent gas. B) Temporary gas, permanent gas. C) Permanent gas, temporary gas. D) Permanent gas, easily liquifiable gas. Show Answer Correct Answer: A) Easily liquefiable gas, permanent gas. 27. The value of the compressibility factor (Z) for an ideal gas is equal to A) R. B) 2. C) 1. D) 1.5 R. Show Answer Correct Answer: C) 1. 28. 21) Permanent hardness is removed by using ..... A) Lime. B) Lime-soda. C) Boiling treatment. D) None of these. Show Answer Correct Answer: B) Lime-soda. 29. Multimolecular layer of adsorption takes place in A) Physical adsorption. B) Chemical adsorption. C) Both. D) None of the above. Show Answer Correct Answer: A) Physical adsorption. 30. Soaps essentially form a colloidal solution in water and remove the greasy matter by A) Emulsification. B) Coagulation. C) Absorption. D) Adsorption. Show Answer Correct Answer: A) Emulsification. 31. Brackish water can be purified using: A) Lime-soda method. B) Permuit process. C) Reverse osmosis method. D) None of these. Show Answer Correct Answer: C) Reverse osmosis method. 32. What causes the stability of lyophobic colloids? A) Electrical charge on particle surface. B) High temperature. C) Adding electrolytes. D) Large particle size. Show Answer Correct Answer: A) Electrical charge on particle surface. 33. Softening of ..... by the ion exchange principle isbased on the adsorption of cations. A) Ground water. B) Sea water. C) Hard water. D) Drinking water. Show Answer Correct Answer: C) Hard water. 34. The amount of heat evolved when 1 mole of any gas is adsorged on a solid adsorbent surface is called A) D. enthalpy of adsorption. B) B. enthalpy. C) A. Entropy. D) C; heat of reaction. Show Answer Correct Answer: A) D. enthalpy of adsorption. 35. When a small amount of FeCl3 is added to a freshly precipitated Fe(OH)3, b reddish brown colloidal solution is obtained. This phenomenon is known as A) Dialysis. B) Dissolution. C) Protection. D) Peptization. Show Answer Correct Answer: C) Protection. 36. Liquid in liquid sol is A) Foam. B) Sol. C) Emulsion. D) Gel. Show Answer Correct Answer: C) Emulsion. 37. 18) Universal solvent is ..... A) Ether. B) Water. C) Benzene. D) Alcohol. Show Answer Correct Answer: B) Water. 38. According to adsorption theory of catalysis, the speed of the reaction increases because A) In the process of adsorption, the activation energy of the molecules becomes large. B) Adsorption produces heat which increases the speed of the reaction. C) The concentration of the reactant molecules at the active centres of the catalyst becomes high due to adsorption. D) Adsorption lowers the activation energy of the reaction. Show Answer Correct Answer: D) Adsorption lowers the activation energy of the reaction. 39. Which of the following is an example of associated colloids? A) Sodium lauryl sulphate. B) Sodium stearate. C) Sodium palmitate. D) All of above. Show Answer Correct Answer: D) All of above. 40. Which one of the following characteristics is associated with adsorption? A) $\Delta$G and $\Delta$H are negative but $\Delta$S is positive. B) $\Delta$G and $\Delta$S are negative but $\Delta$H is positive. C) $\Delta$G is negative but $\Delta$H and $\Delta$S are positive. D) $\Delta$G, $\Delta$H and $\Delta$S all are negative. Show Answer Correct Answer: D) $\Delta$G, $\Delta$H and $\Delta$S all are negative. 41. In physical adsorption, gas molecules are bound on the solid surface by A) Chemical forces. B) Electrostatic forces. C) Gravitational forces. D) Vanderwaal forces. Show Answer Correct Answer: D) Vanderwaal forces. 42. Extent of plysisorption of a gas increases with ..... A) Increase in temperature. B) Decrease in temperature. C) Decrease in strength of van der Waals forces. D) Decrease in surface area of adsorbent. Show Answer Correct Answer: B) Decrease in temperature. 43. The process of removing extra common salt from water is called: A) Disinfections. B) Softening. C) Desalination. D) Deionization. Show Answer Correct Answer: C) Desalination. 44. Which of the following is not a favourable condition for physical adsorption? A) High pressure. B) High temperature. C) Negative $\Delta$. D) Higher critical temperature of adsorbate. Show Answer Correct Answer: B) High temperature. 45. Activated charcoal is used to remove coloring matter from pure substances. It works by ..... A) Absorption. B) Adsorption. C) Bleaching. D) Sorption. Show Answer Correct Answer: B) Adsorption. 46. Method by which lyophobic sol can be protected. A) By addition of lyophilic sol. B) By boiling. C) By addition of oppositely charged sol. D) By addition of an electrolyte. Show Answer Correct Answer: A) By addition of lyophilic sol. 47. Who investigated Brownian motion? A) Robert brown. B) Robert-brown. C) Robert Charles. D) Charles Darwin. Show Answer Correct Answer: A) Robert brown. 48. Rate of physisorption increases with temperature A) Decrease in pressure. B) Decrease in temperature. C) Decrease in surface area. D) Increase in temperature. Show Answer Correct Answer: B) Decrease in temperature. 49. The purpose of an emulsifier is to ..... A) Improve medication taste. B) Minimize the size of globules. C) Decrease surface area in a suspension. D) Reduce the interfacial tension between immiscible phase. Show Answer Correct Answer: D) Reduce the interfacial tension between immiscible phase. 50. Fixed dense layer of ions strongly adsorbed to the surface A) Electric Double Layer. B) Diffuse layer. C) Zeta Potential. D) Stern layer. Show Answer Correct Answer: D) Stern layer. 51. Which of these is an example of a lyophilic sol? A) Starch in water. B) Smoke. C) Gold sol. D) Sulfur sol. Show Answer Correct Answer: A) Starch in water. 52. POWDERED COFFEE AND WATER A) SOL. B) SUS. C) COL. D) None of the above. Show Answer Correct Answer: A) SOL. 53. How many layers are involved in chemical adsorption? A) One. B) Two. C) Zero. D) Many. Show Answer Correct Answer: A) One. 54. The movement of colloidal particles towards the oppositely charged electrodes on passing electric current is known as A) Tyndall Effect. B) Brownian Motion. C) Electrophoresis. D) Coagulation. Show Answer Correct Answer: C) Electrophoresis. 55. For protecting iron pipes from corrosion, they are coated with A) Zinc. B) Aluminium. C) Copper. D) Silver. Show Answer Correct Answer: A) Zinc. 56. Temperature above which micelles formation takes place is called as A) Critical temperature. B) Kraft temperature. C) Freezing point. D) None of these. Show Answer Correct Answer: B) Kraft temperature. 57. Name of the pressure involved in reverse osmosis A) Osmotic pressure. B) Hydrostatic pressure. C) Both a and b. D) None of the above. Show Answer Correct Answer: C) Both a and b. 58. On increasing Temperature, Chemical Adsorption A) First decrease then Increases. B) Decreases. C) Increases. D) First increase then decrease. Show Answer Correct Answer: D) First increase then decrease. 59. Which of the following increases adsorption? A) Decreasing surface area. B) Increasing temperature in all cases. C) Increasing pressure (for gases). D) Decreasing adsorbate concentration. Show Answer Correct Answer: C) Increasing pressure (for gases). 60. When hit by light, what happens to a colloidal mixture? A) Diffracted. B) Absorbed. C) Passes through. D) Reflected. Show Answer Correct Answer: A) Diffracted. Next →Related QuizzesScience QuizzesClass 12 QuizzesClass 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 2Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 3Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 4Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 5Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 6Class 12 Chemistry (Part I) Chapter 1 Solid State QuizClass 12 Chemistry (Part I) Chapter 2 Solutions QuizClass 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books