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 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Water containing dissolved salts with a peculiar salty taste is called: A) Desalinated water. B) Hard water. C) Brackish water. D) Soft water. Show Answer Correct Answer: C) Brackish water. 2. Which of the following is not applicable for chemisorption A) It is reversible. B) Its heat of adsorption is high. C) It forms unimolecular layer. D) Its takes place at high temperature. Show Answer Correct Answer: A) It is reversible. 3. Chemical used in regeneration of cation exchange resin A) HCl. B) MgCl2. C) NaOH. D) CaCO3. Show Answer Correct Answer: A) HCl. 4. Identify the correct statement regarding enzymes: A) Enzymes are specific biological catalysts that can normally function at very high temperature(T = 1000K). B) Enzymes are normally homogeneous catalysts that are very specific action . C) Enzymes are specific biological catalysts that cannot be poisoned. D) Enzymes are specific biological catalysts that that possess well defined active sites . Show Answer Correct Answer: D) Enzymes are specific biological catalysts that that possess well defined active sites . 5. Dispersion method is used to produce colloid from suspension. Which process is not dispersion method? A) Peptization. B) Hydrolysis. C) Mechanical dispersion. D) Bredig's Arch method. Show Answer Correct Answer: B) Hydrolysis. 6. Dust is a colloid. A) A) True. B) B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) A) True. 7. The curve showing the variation of adsorption with pressure at constant temperature is called: A) Adsorption isotherm. B) Absorption isobars. C) An isosters. D) Adsorption isobars. Show Answer Correct Answer: A) Adsorption isotherm. 8. A gas has a definite mass but no definite volume and shape. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 9. It is a process of removing a dissolved substance from a colloidal solution by means of diffusion through a suitable membrane A) Dialysis. B) Peptization. C) Electrophoresis. D) Precipitation. Show Answer Correct Answer: A) Dialysis. 10. How does the surface area of an adsorbent influence its adsorption capacity? A) Surface area has no effect on adsorption. B) Increased surface area decreases adsorption. C) Only the volume of adsorbent matters. D) Increased surface area increases adsorption. Show Answer Correct Answer: D) Increased surface area increases adsorption. 11. What is the primary difference between physisorption and chemisorption? A) Chemisorption occurs at lower temperatures. B) Physisorption is generally weaker and reversible. C) Physisorption involves strong chemical bonds. D) Chemisorption is a reversible process. Show Answer Correct Answer: B) Physisorption is generally weaker and reversible. 12. What is the effect of adding electrolytes to a colloidal system? A) Increase stability. B) Cause coagulation or precipitation. C) Decrease particle size. D) No effect. Show Answer Correct Answer: B) Cause coagulation or precipitation. 13. When a gas is held on the surface of a solid by the chemical bond, then the adsorption is A) Physical adsorption. B) Chemical adsorption. C) Both. D) None of the above. Show Answer Correct Answer: B) Chemical adsorption. 14. What property helps distinguish a colloid from a true solution? A) Color. B) Particle size and light scattering. C) Temperature. D) Density. Show Answer Correct Answer: B) Particle size and light scattering. 15. Which of the following is an example of cationic detergent? A) Sodium salts of alkyl benzene sulphonic acids. B) Sodium salts of alkyl sulphates. C) Polyethers. D) Alkyltrimethyl ammonium chloride. Show Answer Correct Answer: D) Alkyltrimethyl ammonium chloride. 16. Physical adsorption of a gaseous species may change to chemical adsorption with ..... A) Decrease in temperature. B) Decrease in surface area of adsorbent. C) Increase in temperature. D) Increase in surface area of adsorbent. Show Answer Correct Answer: C) Increase in temperature. 17. The exhausted permutit (zeolite) is regenerated by percolating through it a solution of: A) Magnesium chloride. B) Calcium chloride. C) Zinc chloride. D) Sodium chloride. Show Answer Correct Answer: D) Sodium chloride. 18. Activated charcoal is a good catalyst because it: A) Is made up of carbon atoms. B) Has inert nature towards reagents. C) Has more adsorption power. D) Is very reactive. Show Answer Correct Answer: C) Has more adsorption power. 19. # Froth floatation process for the concentration of ores is a practical application of A) Absorption. B) Adsorption. C) Sedimentation. D) Coagulation. Show Answer Correct Answer: B) Adsorption. 20. Colloid preparation from molecules or ions to form colloidal particles is called ..... A) Mechanical dispersion. B) Condensation. C) Peptization. D) Coagulation. Show Answer Correct Answer: B) Condensation. 21. Adsorption is a ..... process A) Exothermic process. B) Endothermic process. C) Both. D) None. Show Answer Correct Answer: A) Exothermic process. 22. Which one of the following is an example of homogeneous catalysis? A) Haber process of synthesis of ammonia. B) Catalytic conversion of SO$_{2}$ to SO$_{3}$ in contact process. C) Acid hydrolysis of methyl acetate. D) Catalytic conversion of water gas to methanol. Show Answer Correct Answer: C) Acid hydrolysis of methyl acetate. 23. Peptisation is a process of A) Movement of colloid under electric potential. B) Precipitation of colloid. C) Purification of colloids. D) Dispersion of precipitate. Show Answer Correct Answer: D) Dispersion of precipitate. 24. Colloidion is 4% solution of which one of the following in alcohol-ether mixture. A) Nitrocellulose. B) Nitroglycerin. C) Glycol dinitrate. D) Cellulose acetate. Show Answer Correct Answer: A) Nitrocellulose. 25. Under which category is colloidal system? A) True solution. B) Heterogeneous mixture. C) Homogeneous mixture. D) Suspensions. Show Answer Correct Answer: B) Heterogeneous mixture. 26. What is called a dispersion medium? A) It is where the dispersed phase settles. B) It is where the solute particles settle. C) It is where the dispersed phase is suspended. D) It is the primary medium. Show Answer Correct Answer: C) It is where the dispersed phase is suspended. 27. When was the scientest that descovered brownian motion was born? A) 1773. B) 1778. C) 1978. D) 1858. Show Answer Correct Answer: A) 1773. 28. Scale formation in boiler causes: A) No loss of heat. B) Wastage of heat. C) Increase in efficiency. D) None of the above. Show Answer Correct Answer: B) Wastage of heat. 29. Milk is an example of a A) Suspension. B) Colloid. C) Solution. D) Solid. Show Answer Correct Answer: B) Colloid. 30. Which one of the following will act as best protective colloid? A) Gum arabic (Gold no-0.15). B) Starch (Gold no-25). C) Gelatin ( Gold no-0.005). D) Egg Albumin (Gold no-0.08). Show Answer Correct Answer: C) Gelatin ( Gold no-0.005). 31. These are the properties of colloid.ElectrophoresisTyndall EffectCoagulationBrownian movementDialysisWhich number that is applied in purification of water using alum? A) 4. B) 5. C) 1. D) 2. E) 3. Show Answer Correct Answer: E) 3. 32. What are colloids? A) Homogeneous system. B) Heterogenous system. C) All the above. D) None of the above. Show Answer Correct Answer: B) Heterogenous system. 33. Hey Alisha, Ria, and Vanya! Let's dive into the fascinating world of surface chemistry. Can you define the term 'contact angle' for me? A) The contact angle is the temperature at which a liquid evaporates. B) The contact angle measures the viscosity of a liquid on a surface. C) The contact angle is the distance between two solid surfaces in contact. D) The contact angle is the angle between a liquid droplet and a solid surface at their interface. Show Answer Correct Answer: D) The contact angle is the angle between a liquid droplet and a solid surface at their interface. 34. Lyophilic colloids is also called as A) Emulsion. B) Irreversible colloids. C) Extrinsic collids. D) Intrinsic Colloids. Show Answer Correct Answer: D) Intrinsic Colloids. 35. Extent of physisorption of a gas increases with ..... A) (iv) decrease in strength of van der Waals forces. B) (ii) decrease in temperature. C) (i) increase in temperature. D) (iii) decrease in surface area of adsorbent. Show Answer Correct Answer: B) (ii) decrease in temperature. 36. As particles approach each other the EDL overlap and cause repulsion A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 37. Peptization denotes: A) Digestion of food. B) Hydrolysis of protein. C) Breaking and dispersion into colloidal state. D) Precipitation of solid from colloidal dimension. Show Answer Correct Answer: C) Breaking and dispersion into colloidal state. 38. Select the colloids coagulated at anode during electrophoresis: A) Blood. B) As2S3. C) Milk. D) Basic Dye. Show Answer Correct Answer: B) As2S3. 39. Micelles behave as colloids only when? A) Concentration is less than CMC. B) They always behave as colloids. C) Concentration is greater than CMC. D) Concentration is equal to CMC. Show Answer Correct Answer: C) Concentration is greater than CMC. 40. Water vapours are A) Adsorbed by CaCl2. B) Absorbed by silica gel. C) Adsorbed by silica gel. D) All are correct. Show Answer Correct Answer: C) Adsorbed by silica gel. 41. The heat of physical adsorption is about: A) Zero. B) 200-500kj/mol. C) 20-40kj/mol. D) Very high. Show Answer Correct Answer: C) 20-40kj/mol. 42. 50) Temporary hardness can be removed by ..... & ..... A) Boiling & zeolite. B) Sodium zeolite &lime soda. C) Boiling & adding lime. D) Lime-soda & adding lime. Show Answer Correct Answer: C) Boiling & adding lime. 43. For which gas Extent of adsorption is maximum A) $NH_3$. B) $H_2$. C) $CO_2$. D) $CH_4$. Show Answer Correct Answer: A) $NH_3$. 44. Chromatography is used to separate different constituents present in a ..... A) Mixture. B) Gas. C) Solid. D) Liquid. Show Answer Correct Answer: A) Mixture. 45. The substance which behave like solute is A) Adsorbent. B) Sorption. C) Desorption. D) Adsorbate. Show Answer Correct Answer: D) Adsorbate. 46. # Fog is a colloidal system of A) Liquid in gas. B) Gas in solid. C) Gas in liquid. D) Gas in gas. Show Answer Correct Answer: A) Liquid in gas. 47. Which one is not a disadvantage of scale A) Formation of wet steam. B) Decrease in efficiency. C) Boiler explosion. D) Wastage of fuel. Show Answer Correct Answer: A) Formation of wet steam. 48. The extent of adsorption i.e. (x/m), where x is the mass of the adsorbate and m is the mass of the adsorbent, depends on the ..... A) Volume. B) Area. C) Pressure. D) Temperature. Show Answer Correct Answer: C) Pressure. 49. Dispersed phase and dispersion medium in fog? A) Liq and gas. B) Gas and liquid. C) Solid and gas. D) Gas and solid. Show Answer Correct Answer: A) Liq and gas. 50. A substance which concentrates at the surface is called A) Adsorbent. B) Absorbent. C) Sorbent. D) Adsorbate. Show Answer Correct Answer: D) Adsorbate. 51. In surface chemistry, what is adsorption? A) Chemical reaction in solution. B) Absorption of substances into the bulk. C) Evaporation of liquids. D) Accumulation of substances at the surface or interface. Show Answer Correct Answer: D) Accumulation of substances at the surface or interface. 52. Which of the following process is not responsible for the presence of electric charge on the sol particles? A) Formation of Helmholtz electrical double layer. B) Electron capture by sol particles. C) Absorption of ionic species from solution. D) Adsorption of ionic species from solution. Show Answer Correct Answer: C) Absorption of ionic species from solution. 53. When carbon dioxide is passed through lime water, the lime water becomes A) Silvery. B) Golden yellow. C) Milky. D) Shiny. Show Answer Correct Answer: C) Milky. 54. The stability of lyophobic sols is due to A) Adsorption of covalent molecules on the colloid. B) The size of the particles. C) The charge on particles. D) Tyndall effect. Show Answer Correct Answer: C) The charge on particles. 55. The formation of micelles takes place only above A) Inversion temperature. B) Critical temperature. C) Kraft temperature. D) Boyle's temperature. Show Answer Correct Answer: C) Kraft temperature. 56. Which of the following electrolytes will have maximum coagulating value for Agl/ $Ag^+$ A) $Na_2SO_4$. B) NaCl. C) $Na_3PO_4$. D) $Na_2S$. Show Answer Correct Answer: C) $Na_3PO_4$. 57. In Langmuir's model of adsorption of a gas on a solid surface A) The mass of gas striking a given area of surface is proportional to the pressure of the gas. B) The rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered. C) The mass of gas striking a given area of surface is independent of the pressure of the gas. D) The adsorption at a single site on the surface may involve multiple molecules at the same time. Show Answer Correct Answer: A) The mass of gas striking a given area of surface is proportional to the pressure of the gas. 58. Which of the following process is responsible for the formation of delta at a place where rivers meet the sea? A) Coagulation. B) Emulsification. C) Peptisation. D) Colloid formation. Show Answer Correct Answer: A) Coagulation. 59. Internal treatment of boiler feed water means: A) Treating water before boiler-feeding it. B) Treating water during evaporation itself. C) Treating after some internal change in boiler designs. D) Treating chemicals directly into the boiler. Show Answer Correct Answer: D) Treating chemicals directly into the boiler. 60. What type of colloid is formed when solid particles are dispersed in a liquid? A) Emulsion. B) Foam. C) Sol. D) Aerosol. Show Answer Correct Answer: C) Sol. ← 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 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