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 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Extent of adsorption of adsorbate from solution phase increases with ..... A) Increase in amount of adsorbate in solution. B) Decrease in surface area of adsorbent. C) Increase in temperature of solution. D) Decrease in amount of adsorbate in solution. Show Answer Correct Answer: A) Increase in amount of adsorbate in solution. 2. Which type of colloids is obtained when both dispersed phase and dispersion medium both are solid A) Sol. B) Solid sol. C) Gel. D) None of the above. Show Answer Correct Answer: B) Solid sol. 3. When a gas is held on the surface of a solid by Van der Waals force, then the adsorption is A) Physical adsorption. B) Chemical adsorption. C) Both. D) None of the above. Show Answer Correct Answer: A) Physical adsorption. 4. What is the process in which colloid will coagulate due to the opposite charge presence? A) Tyndall effect. B) Brownian motion. C) Electrophoresis. D) Dialysis. Show Answer Correct Answer: C) Electrophoresis. 5. Adsorption is invariably an A) Endothermic process. B) Exothermic process. C) Can't be distinguished. D) Both endothermic & exothermic. Show Answer Correct Answer: B) Exothermic process. 6. Hard water may be softened by passing it through: A) Permutit (Zeolite) process. B) Ion exchange resin. C) Sodium hexa meta phosphate (Calgon). D) Demineralization method. Show Answer Correct Answer: A) Permutit (Zeolite) process. 7. Which of the following is lyophilic colloid? A) Milk. B) Fog. C) Blood. D) Gum. Show Answer Correct Answer: D) Gum. 8. For a linear plot of log(x/m) versus log p in a Freundlich adsorption isotherm, which of the following statements is correct? (k and n are constants) A) 1/n appears as the intercept. B) Only 1/n appears as the slope. C) Log(1/n) appears as the intercept. D) Both k and 1/n appear in the slope term. Show Answer Correct Answer: B) Only 1/n appears as the slope. 9. Coconut oil is non polar, while water is polar. They can not be mixed and will not dissolve each other.Emulsion is produce when oil-water mixture is shaken and is added by ..... A) Soap solution. B) Kerosene. C) Hot water. D) Salt solution. Show Answer Correct Answer: A) Soap solution. 10. If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as A) Sol. B) Gel. C) Emulsion. D) Foam. Show Answer Correct Answer: B) Gel. 11. Which of the following is NOT an example of a colloid? A) Milk. B) Saltwater solution. C) Fog. D) Gelatin. Show Answer Correct Answer: B) Saltwater solution. 12. An adsorption isotherm is a graph plotted between magnitude of ..... and ..... A) Pressure and temperature. B) Temperature, surface area. C) Adsorption, pressure. D) Absorption and adsorption. Show Answer Correct Answer: C) Adsorption, pressure. 13. The minimum amount of an electrolyte required to cause coagulation of a sol is called: A) Coagulation value. B) Gold number. C) Protective value. D) None of these. Show Answer Correct Answer: A) Coagulation value. 14. .Most micelles are spherical and contain between ..... surfactant monomers A) 1500-2000. B) 50-100. C) 150-200. D) 0-50. Show Answer Correct Answer: B) 50-100. 15. When FeCl$_{3}$ solution is added to NaOH a negatively charged colloidal solution is obtained. It is due to: A) Preferential adsorption of OH-ions. B) Self dissociation. C) Electron capture by solution particles. D) Presence of basic group. Show Answer Correct Answer: A) Preferential adsorption of OH-ions. 16. What is the value of R in calK$^{-1}$mol$^{-1}$ A) 8.314*10$^{7}$. B) 0.0821. C) 8.314. D) 1.987. Show Answer Correct Answer: D) 1.987. 17. Chemical not used in EDTA method A) EBT. B) Ammonia buffer. C) Standard hard water. D) CH3COOH. Show Answer Correct Answer: D) CH3COOH. 18. Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ sol? A) $Na_2SO_4$. B) $Na_2S$. C) NaCl. D) $Na_3PO_4$. Show Answer Correct Answer: D) $Na_3PO_4$. 19. Colloids have great affinity of dispersion medium? A) Hydroponic colloids. B) Lyophobic colloids. C) Lipophilic colloids. D) Hydrophilic colloids. Show Answer Correct Answer: C) Lipophilic colloids. 20. The minimum temperature required for formation of associated colloid is called ..... A) Boyle's temperature. B) Kraft temperature. C) Inversion temperature. D) Critical temperature. Show Answer Correct Answer: B) Kraft temperature. 21. Which of the following not form a macromolecular colloids in water A) Sodium stearate. B) Enzyme. C) Starch. D) Nylon. Show Answer Correct Answer: A) Sodium stearate. 22. Which of the following electrolytes will have maximum coagulating value for AgI/Ag$^{+}$ sol? (AgI/Ag+ implies positive sol) A) $Na_2S$. B) $Na_2SO_4$. C) NaCl. D) $Na_3PO_4$. Show Answer Correct Answer: D) $Na_3PO_4$. 23. Reason for temporary hardness A) CaSO$_{4}$. B) CaCO$_{3}$. C) MgSO$_{4}$. D) MgCl$_{2}$. Show Answer Correct Answer: B) CaCO$_{3}$. 24. What is the name of the boundary layer surrounding a colloidal particle? A) Micelle. B) Adsorption layer. C) Surface tension. D) Electrical double layer. Show Answer Correct Answer: D) Electrical double layer. 25. 'Greater the valency, the higher is the ciagulating power of ion'. This rule was introduced by A) Hardy Schulz. B) Faraday. C) Maxwell. D) Hardy Lewis. Show Answer Correct Answer: A) Hardy Schulz. 26. The dispersion medium in cloud is A) Water. B) Solid. C) Liquid. D) Gas. Show Answer Correct Answer: D) Gas. 27. Finely divided metals and porous substances provide A) Large surface area. B) Small surface area. C) No surface area. D) Moderate surface area. Show Answer Correct Answer: A) Large surface area. 28. What is an ideal gas A) A gas obeys the gas laws. B) A gas which doesn't obey the Charles' law. C) A gas does not obey the gas laws. D) A gas obeys only the Boyle's law. Show Answer Correct Answer: A) A gas obeys the gas laws. 29. Which is the example of hydrophilic colloid? A) Milk. B) Gold sol. C) Mayonnaise. D) Gel. Show Answer Correct Answer: D) Gel. 30. Which of the following statement is correct regarding chemical adsorption? A) It occurs at low temperature. B) It forms monolayer. C) It is reversible in nature. D) It is not specific in nature. Show Answer Correct Answer: C) It is reversible in nature. 31. Which one of the following is an example of adsorption? A) Ammonia in contact with water. B) Ammonia in contact with hydrogen gas. C) Silica gel in contact with water vapors. D) None of above. Show Answer Correct Answer: C) Silica gel in contact with water vapors. 32. How are colloidal solutions of gold prepared by different colours? A) Variable valency of gold. B) Different concentration of gold particles. C) Different diameters of colloidal gold particles. D) Impurities produced by different methods. Show Answer Correct Answer: C) Different diameters of colloidal gold particles. 33. Define adsorbate. A) The removal of adsorbed particles. B) A substance in the adsorbed phase. C) A solid material on which adsorption occurs. D) The study on the interaction phenomena on the surface. Show Answer Correct Answer: B) A substance in the adsorbed phase. 34. 48) The metal EDTA complex is stable at pH . This pH range is maintained by adding buffer. A) 6-9, platinum. B) 8-10, ammonium. C) 9-10, argentonium. D) 7-10, aluminium. Show Answer Correct Answer: B) 8-10, ammonium. 35. Activated adsorption is the other name of A) Physisorption. B) Chemisorption. C) Absorption. D) Sorption. Show Answer Correct Answer: B) Chemisorption. 36. Which are not purely surface phenomena? A) Surface tension, viscosity. B) Absorption, viscosity. C) Adsorption, viscosity. D) Adsorption, surface tension. Show Answer Correct Answer: B) Absorption, viscosity. 37. Chemisorption is held by A) Chemical forces. B) Van der Waal forces. C) Centrifugal. D) Covalent bond. Show Answer Correct Answer: D) Covalent bond. 38. Which of the following is an associated colloid? A) Starch. B) Sol of gold. C) Soap. D) Proteins. Show Answer Correct Answer: C) Soap. 39. What is the primary difference between adsorption and absorption? A) Adsorption involves surface interaction, while absorption involves bulk uptake. B) Adsorption occurs only in gases, while absorption occurs in liquids. C) Adsorption is a chemical process, while absorption is physical. D) Adsorption is always reversible, while absorption is not. Show Answer Correct Answer: A) Adsorption involves surface interaction, while absorption involves bulk uptake. 40. Which one of the following is not a boiler trouble? A) Priming. B) Sludge. C) Zeolite. D) Scale. Show Answer Correct Answer: C) Zeolite. 41. Which substance that includes in aerosol system? A) Paint. B) Smoke. C) Soap foam. D) Colored glass. Show Answer Correct Answer: B) Smoke. 42. How crystals of pure substance are formed A) By crystallization. B) By chromatography. C) By peptization. D) By all of these method. Show Answer Correct Answer: A) By crystallization. 43. Which forms multi molecular layers during adsorption A) Vander waal's adsorption. B) Physical adsorption. C) Freundlich adsorption. D) All are correct. Show Answer Correct Answer: D) All are correct. 44. Which of the following ion will have highest coagulating power for coagulating a negatively charged sol? A) $NaCl$. B) $AlCl_3$. C) $KCl$. D) $CaCl_2$. Show Answer Correct Answer: B) $AlCl_3$. 45. What type of adsorption is typically characterized by a high activation energy? A) Chemiabsorption. B) Physical adsorption. C) Chemisorption. D) Physisorption. Show Answer Correct Answer: C) Chemisorption. 46. Indicator used in EDTA method A) Methyl orange. B) EBT. C) Methyl red. D) Phenolphthalein. Show Answer Correct Answer: B) EBT. 47. Which of the following is incorrect about bredig's arc method A) This is case of dispersion and condensation both. B) We can prepare Metal Sol. C) High potential difference is applied across electrodes. D) This is dispersion method. Show Answer Correct Answer: D) This is dispersion method. 48. Which of the following statements is not correct in respect of lyophilic sols A) These are stable and not easily coagulated. B) They carry positive charge. C) Particles are hydrated. D) There is a considerable interaction between the dispersed phase and dispersion medium. Show Answer Correct Answer: B) They carry positive charge. 49. Gold sol can be prepared by A) Oxidation of Gold by aqua-regia. B) Peptization. C) Reduction of AuCl$_{3}$ with HCHO solution. D) Hydrolysis of AuCl$_{3}$. Show Answer Correct Answer: C) Reduction of AuCl$_{3}$ with HCHO solution. 50. 19) The presence of bicarbonates of calcium and magnesium A) Temporary Hardness. B) Permanent hardness. C) Total hardness. D) None of these. Show Answer Correct Answer: A) Temporary Hardness. 51. Hardy-Schulze law states that: A) Solution must have higher gold number. B) Disperse phase and dispersion medium must be of the same sign. C) Micelles coagulate in presence of surfactants. D) The ions carrying more opposite charge to that of sol particle are effective in coagulation. Show Answer Correct Answer: D) The ions carrying more opposite charge to that of sol particle are effective in coagulation. 52. A sample of helium gas has a volume of 520cm$^{3}$ at 100$^{0}$C. Calculate the temperature at which the volume will become 250cm$^{3}$. Assume the pressure to be constant A) 236.45K. B) 101.23K. C) 179.33K. D) None of the above. Show Answer Correct Answer: C) 179.33K. 53. The scattering of light by the dispersed phase is called A) Brownian Movement. B) Tyndall Effect. C) Adsorption. D) None of these. Show Answer Correct Answer: B) Tyndall Effect. 54. What is the charge on hydroxide sol? A) Positive. B) Negative. C) Both. D) None. Show Answer Correct Answer: A) Positive. 55. What is brownian movement? A) Reflection of colloids. B) Dispersion of colloids. C) Adsorption of colloids. D) Zigzag movement of colloids. Show Answer Correct Answer: D) Zigzag movement of colloids. 56. EDL stands for ..... A) Electric double layer. B) Element double layer. C) Element diffuse layer. D) Electric diffuse layer. Show Answer Correct Answer: A) Electric double layer. 57. What is the role of molybdenum in Haber's process for manufacture of ammonia? A) As a catalyst. B) As a reactant. C) As a catalytic poison. D) As a catalytic promoter. Show Answer Correct Answer: D) As a catalytic promoter. 58. A colloidal system having a solid substance as the dispersed phase and a liquid as the dispersion medium.Identify the colloidal type that best describes the system above. A) Solid Sol. B) Sol. C) Emulsion. D) Gel. Show Answer Correct Answer: B) Sol. 59. A catalyst increases the rate of the reaction because it A) Decreases the collision diameter. B) Increases the temperature co-efficient. C) Lowers the energy barrier for reaction. D) Increases the activation energy. Show Answer Correct Answer: C) Lowers the energy barrier for reaction. 60. Assertion:A gas with higher critical temperature gets adsorbed to more extent than a gas with lower critical temperature.Reason:The easily liquifiable gases get adsorbed to more extent. A) Assertion is true but the reason is false. B) Assertion is false but the reason in true. C) Both assertion and reason are true and the reason is a correct explanation of assertion. D) If both assertion and reason are true but reason is not a correct explanation of assertion. Show Answer Correct Answer: C) Both assertion and reason are true and the reason is a correct explanation of assertion. ← 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 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