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 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Fog is an example of which type of colloidal system? A) Gas in liquid. B) Solid in gasLiquid in gas. C) Gas in gas. D) Liquid in gas. Show Answer Correct Answer: B) Solid in gasLiquid in gas. 2. Which factor does NOT affect adsorption? A) Temperature. B) Color of adsorbent. C) Surface area of adsorbent. D) Concentration of adsorbate. Show Answer Correct Answer: B) Color of adsorbent. 3. What is dialysis in relation to colloids? A) Separation of colloidal particles by size exclusion. B) Adding surfactants. C) Heating of colloids. D) Evaporation process. Show Answer Correct Answer: A) Separation of colloidal particles by size exclusion. 4. Whether the gas has mass A) Yes. B) No. C) None of the above. D) Can't Predict. Show Answer Correct Answer: A) Yes. 5. At what pH range the rate of enzyme catalysed reaction is maximum? A) 6 to 8. B) 7 to 9. C) 8 to 9. D) 5 to 7. Show Answer Correct Answer: D) 5 to 7. 6. The term 'sorption' stands for ..... A) Absorption. B) Adsorption. C) Both absorption and adsorption. D) Desorption. Show Answer Correct Answer: C) Both absorption and adsorption. 7. What is the primary factor that influences the rate of adsorption? A) Size of the adsorbate molecules. B) Nature of the adsorbent surface. C) Shape of the adsorbate. D) Color of the adsorbent. Show Answer Correct Answer: B) Nature of the adsorbent surface. 8. What is the primary mechanism by which adsorption occurs? A) Surface interaction between adsorbate and adsorbent. B) Diffusion through a membrane. C) Condensation of gases. D) Evaporation of the adsorbate. Show Answer Correct Answer: A) Surface interaction between adsorbate and adsorbent. 9. What is the dispersed phase and dispersion medium of aersol? A) Gas, liquid. B) Gas, solid. C) Liquid, solid. D) Liquid, liquid. Show Answer Correct Answer: C) Liquid, solid. 10. The type of colloidal dispersion obtained when egg protein is mixed with water A) Macromolecular colloids. B) Associated colloids. C) Multimolecular Colloids. D) Lyophilic colloids. Show Answer Correct Answer: A) Macromolecular colloids. 11. Majority of particles in water have negative charge A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 12. DETERGENTS WITH LOW CMC ARE MORE ECONOMICAL TO USE A) YES, MICELLE FORMED AT HIGH CONC. B) YES, MICELLE FORMED AT LOW CONC. C) NO, MICELLE FORMED AT LOW CONC. D) NO, MICELLE FORMED AT LOW CONC. Show Answer Correct Answer: B) YES, MICELLE FORMED AT LOW CONC. 13. Electro-osmosis is observed when: A) Dispersion medium particles begins to move in an electric field. B) Dispersed phase begins to move in an electric field. C) Both (a) and (b). D) One of the above. Show Answer Correct Answer: A) Dispersion medium particles begins to move in an electric field. 14. Foam is a colloidal system which consists of a dispersed phase and a dispersion medium. Indicate the dispersed phase and dispersion medium of foam, respectively. A) Liquid and liquid. B) Solid and gas. C) Liquid and solid. D) Gas and liquid. Show Answer Correct Answer: D) Gas and liquid. 15. The dispersal of a precipitated material into colloidal solution by the action of an electrolyte in solutionis called A) Ultra-filtration. B) Dialysis. C) Coagulation. D) Peptization. Show Answer Correct Answer: D) Peptization. 16. A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as ..... A) Solution. B) Solid solution. C) Emulsion. D) Gel. Show Answer Correct Answer: A) Solution. 17. Another name of permanent hardness A) Non-carbonate hardness. B) Carbonate hardness. C) Bicarbonate hardness. D) None of the above. Show Answer Correct Answer: A) Non-carbonate hardness. 18. Physical adsorption A) Increases with increase in temperature. B) Decreases with increase in temperature. C) Occurs readily at high temperature. D) None. Show Answer Correct Answer: B) Decreases with increase in temperature. 19. These are colloidal system that the dispersed phase is liquid, except ..... A) Milk. B) Margarine. C) Soap foam. D) Fog. Show Answer Correct Answer: C) Soap foam. 20. Extent of physisorption increases with A) Decrease in temperature. B) Increase in temperature. C) Decrease in strength of van der waal forces. D) Decrease in surface area. Show Answer Correct Answer: A) Decrease in temperature. 21. Lyophobic colloids are A) Solvent loving. B) Water loving. C) Irreversible. D) Reversible. Show Answer Correct Answer: C) Irreversible. 22. By using what can the colloidal particles can be separated from particles of true solution? A) An electrolyte. B) An ultracentrifuge machine. C) Ordinary cloth. D) Parchment paper. Show Answer Correct Answer: D) Parchment paper. 23. The substance which when dissolved in a medium at higher concentration behave as a colloidal sol is A) Multimolecular Colloids. B) Micromolecular colloids. C) Associated colloids. D) Macromolecular colloids. Show Answer Correct Answer: C) Associated colloids. 24. Absorbed acetic acid on activated carbon is: A) Adsorbate. B) Adsorbent. C) Absorber. D) Adsorber. Show Answer Correct Answer: A) Adsorbate. 25. During adsorption, entropy A) Increases. B) Decreases. C) Remains same. D) None of the above. Show Answer Correct Answer: B) Decreases. 26. Adsorption is divided in to A) Physical adsorption. B) Chemical adsorption. C) Both a and b. D) None of these. Show Answer Correct Answer: C) Both a and b. 27. Physical adsorption is: A) Highly specific. B) Irreversible. C) Not very specific. D) Considerable at high temperature. Show Answer Correct Answer: C) Not very specific. 28. The name of the sol if the dispersion medium is water A) Benzosol. B) Aerosol. C) Alcosol. D) Aquasol. Show Answer Correct Answer: D) Aquasol. 29. Which the following is not a colloidal system A) Latex. B) Hard water. C) Pumice stone. D) Ink. Show Answer Correct Answer: B) Hard water. 30. Dispersed phrase and dispersion medium in jellies are respectively A) Solid and liquid. B) Liquid and solid. C) Liquid and liquid. D) Solid and solid. Show Answer Correct Answer: B) Liquid and solid. 31. Fe3+ ions cogulate blood. This show blood contains colloidal particle bearing A) Negative charge. B) Positive charge. C) Either positive or negative charge. D) No charge. Show Answer Correct Answer: A) Negative charge. 32. WHICH OF THE FOLLOWING IS AN EXAMPLE OF ABSORPTION A) WATER ON CALCIUM CHLORIDE. B) OXYGEN ON METAL SURFACE. C) HYDROGEN ON FINELY DIVIDED NICKLE. D) WATER ON SILICA GEL. Show Answer Correct Answer: A) WATER ON CALCIUM CHLORIDE. 33. In Freundlich adsorption isotherm x/m = Kp1/n, the value of 'n' at low pressure is A) Equal to one. B) From zero to one. C) More than one. D) Less than one. Show Answer Correct Answer: A) Equal to one. 34. In gas masks, activated charcoal is used to ..... the toxic gases andvapours. A) Desorb. B) Adsorb. C) Sorb. D) Absorb. Show Answer Correct Answer: B) Adsorb. 35. Match the following1) Scale-Permanent hardness (a)2)Sludge-Temporary hardness (b)3)MgCl2-hard precipitate (c)4)Ca (HCO3)2-loose precipitate (d) A) 1-c, 2-d, 3-b, 4-a. B) 1-c, 2-d, 3-a, 4-b. C) 1-d, 2-c, 3-a, 4-b. D) 1-c, 2-b, 3-a, 4-d. Show Answer Correct Answer: B) 1-c, 2-d, 3-a, 4-b. 36. Which type of adsorption have high activation energy A) Chemical adsorption. B) Physical adsorption. C) Both. D) None of the above. Show Answer Correct Answer: A) Chemical adsorption. 37. WHICH OF THE FOLLOWING WILL PRECIPITATE THE NEGATIVELY CHARGED COLLOID A) UREA. B) KCL. C) SOL. D) GLUCOSE. Show Answer Correct Answer: B) KCL. 38. Entropy during adsorption ..... A) Cannot say. B) Decreases. C) Remain Same. D) Increases. Show Answer Correct Answer: B) Decreases. 39. Electro disintegration method is used to obtain A) Non Ionic colloids. B) Metallic Colloids. C) Lyophilic colloids. D) Lyophobic colloids. Show Answer Correct Answer: B) Metallic Colloids. 40. Bredig's arc method is used for the preparation of colloidal soln of: A) Inorganic compounds. B) Organic compounds. C) Metal like silver, gold, etc. D) Two liquids. Show Answer Correct Answer: C) Metal like silver, gold, etc. 41. A colloidal system having a solid substance as a dispersion phase and liquid as a dispersion medium is classified as A) Gel. B) Solid sol. C) Emulsion. D) Sol. Show Answer Correct Answer: D) Sol. 42. How many layers are adsorbed in chemical adsorption? A) Many. B) Two. C) One. D) Zero. Show Answer Correct Answer: C) One. 43. Colloidal conditioning is an A) External method. B) Boiler corrosion. C) Desalination method. D) Internal method. Show Answer Correct Answer: A) External method. 44. Which type of adsorption is typically irreversible? A) Chemiabsorption. B) Physical adsorption. C) Chemisorption. D) Physisorption. Show Answer Correct Answer: C) Chemisorption. 45. What role does temperature play in the adsorption process? A) Lower temperatures generally favor adsorption. B) Temperature has no effect on adsorption. C) Higher temperatures always increase adsorption. D) Temperature only affects physisorption. Show Answer Correct Answer: A) Lower temperatures generally favor adsorption. 46. Critical Volume is directly proportional to A) A. B) B. C) R. D) Both a and b. Show Answer Correct Answer: B) B. 47. What kind of bond is involved in chemisorption? A) Ionic or covalent bonds. B) Hydrogen bonds. C) Van der Waals forces. D) Metallic bonds. Show Answer Correct Answer: A) Ionic or covalent bonds. 48. Identify the property of colloid related to Tyndall effect. A) Optical property. B) Mechanical property. C) Colligative property. D) Electrical property. Show Answer Correct Answer: A) Optical property. 49. S.I. unit of vander Waals constant b is m$^{3}$/mol A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 50. The best coagulant for the precipitation of Fe(OH)$_{3}$ sol is A) Na$_{2}$SO$_{4}$. B) Na$_{3}$PO$_{4}$. C) NaNO$_{3}$. D) Na$_{2}$HPO$_{3}$. Show Answer Correct Answer: B) Na$_{3}$PO$_{4}$. 51. Which one is not a unit of hardness? A) Degree Clarke. B) Kelvin. C) Ppm. D) Mg/L. Show Answer Correct Answer: B) Kelvin. 52. Adsorption of gases on solid surface is generally exothermic because A) Entropy increases. B) Free energy increases. C) Enthalpy is positive. D) Entropy decreases. Show Answer Correct Answer: D) Entropy decreases. 53. Which type of colloid has liquid dispersed in a gas? A) Emulsion. B) Gel. C) Foam. D) Sol. Show Answer Correct Answer: C) Foam. 54. Adsorption is a surface phenomenon A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 55. Zig Zag movement of colloidal particles is known as A) Brownian motion. B) U Brownian motion. C) Both. D) None of the above. Show Answer Correct Answer: A) Brownian motion. 56. The gas molecules or atoms held to the solid surfaces by a chemical bond are called A) Adsorption. B) Physiorption. C) Adsorption. D) Chemisorption. Show Answer Correct Answer: D) Chemisorption. 57. When did the scintest that descovered browain motion? A) 1987. B) 1989. C) 1858. D) 1856. Show Answer Correct Answer: C) 1858. 58. Which of the following statements is incorrect regarding physisorption? A) It occurs because of van der Walls forces. B) More easily liquefiable gases are adsorbed readily. C) Under high pressure it results into multimolecular layer on adsorbent surface. D) Enthalpy of adsorption ($\Delta$H$_{adsorption}$) is low and positive. Show Answer Correct Answer: D) Enthalpy of adsorption ($\Delta$H$_{adsorption}$) is low and positive. 59. A graph between the amount of the gas adsorbed per gram of the adsorbent and the equilibrium pressure of the adsorbate at constant at constant temperature is called A) Adsorption isotherm. B) Adsorption isobar. C) Both. D) None of the above. Show Answer Correct Answer: A) Adsorption isotherm. 60. Recognize the method in preparing lyophilic sol. A) Mechanical dispersion. B) Direct mixing of the solid with the liquid. C) Peptization. D) Chemical reduction. Show Answer Correct Answer: B) Direct mixing of the solid with the liquid. ← PreviousNext →Related QuizzesScience QuizzesClass 12 QuizzesClass 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 1Class 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 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