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 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Hardness is represented as A) Magnesium carbonate equivalent. B) Sodium carbonate equivalent. C) Calcium carbonate equivalent. D) Calcium sulphate equivalent. Show Answer Correct Answer: C) Calcium carbonate equivalent. 2. Which gas is adsorbed strongly be charcoal A) N$_{2}$. B) O$_{2}$. C) CO. D) H$_{2}$. Show Answer Correct Answer: C) CO. 3. Which of the following colloidal system represents a gel? A) Liquid in gas. B) Liquid in solid. C) Solid in liquid. D) Solid in gas. Show Answer Correct Answer: B) Liquid in solid. 4. A biological catalyst is: A) A carbohydrate. B) A nitrogenous organic compound. C) An amino acid. D) An enzyme. Show Answer Correct Answer: D) An enzyme. 5. Sodium laurel Sarcosinate is an example of ..... A) Anionic surfactants. B) Zwitter ionic surfactants. C) Non-ionic surfactants. D) Cationic surfactants. Show Answer Correct Answer: A) Anionic surfactants. 6. The mathematical expression for adsorption given by Freundlich is A) X/m = kP1/n. B) X/m =kP. C) X/n = kP. D) S/m = kPn. Show Answer Correct Answer: A) X/m = kP1/n. 7. Converting a freshly prepared substance into colloidal state by shaking with a suitable electrolyte A) Flocculation. B) Precipitation. C) Coagulation. D) Peptization. Show Answer Correct Answer: D) Peptization. 8. Movement of dispersion medium under the influence of electronic field is called as- A) Electrodialysis. B) Cataphoresis. C) Electro-osmosis. D) Electrophoresis. Show Answer Correct Answer: C) Electro-osmosis. 9. Internal treatment of boiler feed water involves: A) To precipitate the scale forming substances in the form of sludge. B) To convert them into soluble substances. C) Both of the above. D) None of the above. Show Answer Correct Answer: C) Both of the above. 10. Blow down operation causes the removal of: A) Scales. B) Sludges. C) Both of these. D) Hot water only. Show Answer Correct Answer: B) Sludges. 11. The extent of adsorption of a gas on a solid depends on ..... A) Temperature of the gas. B) Pressure of the gas. C) Nature of the gas. D) All are correct. Show Answer Correct Answer: D) All are correct. 12. The protective power of lyophilic colloidal sol is expressed in terms of A) CMC (Critical Micelle Concentration). B) Gold number. C) Oxidation numbers. D) Coagulation value. Show Answer Correct Answer: B) Gold number. 13. Which of the following is correct about lyophilic sol? A) They are irreversible. B) They are self-stabilised. C) They are formed by inorganic Substance. D) They are readily coagulated by addition of electrolyte. Show Answer Correct Answer: B) They are self-stabilised. 14. In Freundlich Adsorption isotherm, the value of 1/n is A) 1 in case of physical adsorption. B) 1 in case of chemical adsorption. C) Between 0 and 1 in all cases. D) Less than 0 all cases. Show Answer Correct Answer: C) Between 0 and 1 in all cases. 15. Which of the following does NOT occur at the interface of phases? A) Crystallisation. B) Heterogenous catalysts. C) Homogenous catalysts. D) Corrosion. Show Answer Correct Answer: C) Homogenous catalysts. 16. Water which does not produce lather with soap solution A) Hard water. B) Soft water. C) Distilled water. D) None of the above. Show Answer Correct Answer: A) Hard water. 17. Which method can be used to separate colloids? A) Simple filtration. B) Ultrafiltration or centrifugation. C) Evaporation. D) Crystallization. Show Answer Correct Answer: B) Ultrafiltration or centrifugation. 18. Hey Aisha, have you ever wondered about the fascinating world of surface chemistry in catalysis? Let's explore its applications! A) Reducing the cost of raw materials. B) Increasing the temperature of reactions. C) Eliminating the need for catalysts. D) Applications of surface chemistry in catalysis include enhancing reaction rates, improving selectivity, and optimizing catalyst design through the manipulation of surface properties. Show Answer Correct Answer: D) Applications of surface chemistry in catalysis include enhancing reaction rates, improving selectivity, and optimizing catalyst design through the manipulation of surface properties. 19. What is the characteristic of elastic collisions? A) Loss of energy during the collision. B) No loss of energy during the collision. C) Loss of matter. D) All are correct. Show Answer Correct Answer: B) No loss of energy during the collision. 20. 47)Match the following1) Calgon-kerosene, agar-agar, gelatin, glue (a)2) Sodium Phosphate-NaAlO2 (b)3)Colloidal Conditioning-Na3PO4 (c)4)Sodium Aluminate-Na2(Na4(PO3)6 (d) A) 1-a, 2-b, 3-c, 4-d. B) 1-c, 2-d, 3-a, 4-b. C) 1-d, 2-a, 3-c4-b. D) 1-d, 2-c, 3-a, 4-b. Show Answer Correct Answer: D) 1-d, 2-c, 3-a, 4-b. 21. Area of interface separating two phases depends on A) Temperature of the particles. B) Shape of the particles. C) Size of the particles. D) Independent. Show Answer Correct Answer: C) Size of the particles. 22. Which one from these phenomenons that is not related to the colloidal system? A) Dialysis. B) Tyndall Effect. C) Absorption. D) Electrophoresis. Show Answer Correct Answer: C) Absorption. 23. Movement of colloidal particles under the influence of an electric field is called A) Electrophoresis. B) Electroosmosis. C) Both. D) None of the above. Show Answer Correct Answer: A) Electrophoresis. 24. Blue colour of the sky is due to: A) Absorption of light by dust particles. B) Presence of clouds. C) Scattering of light by dust particles. D) Reflection of light by dust particles. Show Answer Correct Answer: C) Scattering of light by dust particles. 25. Which of the following substances will precipitate the negatively charged emulsions? A) KCl. B) Glucose. C) Urea. D) None of the above. Show Answer Correct Answer: A) KCl. 26. Adsorption is accompanied by A) Decrease in entropy of the system. B) Decrease in enthalpy of the system. C) T$\Delta$S for the process is negative. D) All of the above. Show Answer Correct Answer: D) All of the above. 27. 20) The presence of chlorides and sulphates of calcium and magnesium A) Temporary Hardness. B) Permanent hardness. C) Total hardness. D) None of these. Show Answer Correct Answer: B) Permanent hardness. 28. For the coagulation of 50mL of ferric hydroxide sol. 10mL of 0.5 M KCl is required. What is the coagulation value of KCl? A) 5. B) 10. C) 100. D) None of these. Show Answer Correct Answer: C) 100. 29. Which of the following interface cannot be obtained? A) Gas-gas. B) Liquid-liquid. C) Liquid-gas. D) Solid-liquid. Show Answer Correct Answer: A) Gas-gas. 30. What is the primary characteristic of physisorption? A) It involves strong chemical bonds. B) It is generally reversible and weaker. C) It occurs at high temperatures. D) It is limited to solid adsorbents only. Show Answer Correct Answer: B) It is generally reversible and weaker. 31. The diameter of particles in colloidal system is A) 10$^{-9}$ m to 10$^{-6}$ m. B) 10$^{-12}$ m to 10$^{-9}$ m. C) 10$^{-10}$ m to 10$^{-4}$ m. D) 10$^{-7}$ m to 10$^{-5}$ m. Show Answer Correct Answer: A) 10$^{-9}$ m to 10$^{-6}$ m. 32. The Langmuir adsorption isotherm is deduced using the assumption A) The adsorbed molecules interact with each other. B) The heat of adsorption varies with coverage. C) The adsorption takes place in multilayers. D) The adsorption sites are equivalent in their ability to adsorb the particles. Show Answer Correct Answer: D) The adsorption sites are equivalent in their ability to adsorb the particles. 33. Which is favourable for physical adsorption? A) High T and high P. B) High T and low P. C) Low T and high P. D) T and P do not affect. Show Answer Correct Answer: C) Low T and high P. 34. Silica and alumina are used as adsorbents for removing ..... and controlling humidity in a room A) Hot. B) Temperature. C) Moisture. D) Cooling. Show Answer Correct Answer: C) Moisture. 35. Critical Temperature is directly proportional to A) A. B) B. C) R. D) Both a and b. Show Answer Correct Answer: A) A. 36. Chemisorption is A) Multimolecular nature. B) Reversible. C) Often highly specific and directional. D) Not specific. Show Answer Correct Answer: C) Often highly specific and directional. 37. Surface compound formation takes place in A) Sorption. B) Physical adsorption. C) Desorption. D) Chemical adsorption. Show Answer Correct Answer: D) Chemical adsorption. 38. Select the FALSE statement about adsorption. A) The value of adsorption enthalpy of physical adsorption is less than chemical adsorption. B) Physical adsorption occurs due to Van der Waals'forces. C) Chemical adsorption decreases at high temperature and low pressure. D) Physical adsorption is reversible. Show Answer Correct Answer: C) Chemical adsorption decreases at high temperature and low pressure. 39. Method which is used to remove both cations and anions form hard water 8. Another name of permanent hardness a) Non-carbonate hardnessb) Carbonate hardness c) Bicarbonate hardnessd) None of the above A) Ion-exchange method. B) Blow down operation. C) EDTA method. D) Zeolite method. Show Answer Correct Answer: A) Ion-exchange method. 40. The action of enzyme in living system is to: A) Circulates oxygen. B) Enhances the rate of biochemical reactions. C) Supply energy to tissues. D) Enhances immunity. Show Answer Correct Answer: B) Enhances the rate of biochemical reactions. 41. Which shape selective catalyst is used to convert alcohol to gasoline? A) ZSM-5. B) Trpsin. C) Calgon. D) Zeigler-Natta catalyst. Show Answer Correct Answer: A) ZSM-5. 42. Which of the following statement is not correct regarding physical and chemical adsorption? A) Physical adsorption has low heat of adsorption than chemical adsorption. B) Chemical adsorption is highly specific in nature while physical adsorption is not. C) Chemical adsorption forms multimolecular layer while physical adsorption forms monolayer. D) Physical adsorption is reversible while chemical is irreversible. Show Answer Correct Answer: C) Chemical adsorption forms multimolecular layer while physical adsorption forms monolayer. 43. Which one will act as best protective colloid A) Egg albumin( gold no 0.08). B) Gum arabic(Gold no 0.15). C) Gelatin (Gold no-0.005). D) Starch(gold no-25). Show Answer Correct Answer: C) Gelatin (Gold no-0.005). 44. When dispersed phase is liquid and dispersion medium is gas, the colloidal system is called: A) Smoke. B) Gel. C) Emulsion. D) Aerosol. Show Answer Correct Answer: D) Aerosol. 45. A particular adsorption process has the following characteristics:(i) It arises due to van der Waals forces and(ii) it is reversible.Identify the correct statement that describes the above adsorption process A) Adsorption increases with increase in temperature. B) Enthalpy of adsorption is greater than 100 kJ mol$^{-1}$. C) Adsorption is monolayer. D) Energy of activation is low. Show Answer Correct Answer: D) Energy of activation is low. 46. Digestion of food is difficult during fever because A) The digestive system expands. B) The pressure inside the body decreases with respect to outside pressure. C) The volume of the tracts contracts. D) Increase in temperature results in low absorption. Show Answer Correct Answer: D) Increase in temperature results in low absorption. 47. What is the significance of the Langmuir isotherm in adsorption studies? A) It is used to calculate the boiling point of liquids. B) It models adsorption on a surface with a finite number of identical sites. C) It describes the relationship between pressure and volume. D) It explains the diffusion of gases in liquids. Show Answer Correct Answer: B) It models adsorption on a surface with a finite number of identical sites. 48. If the surface area per unit mass of the ..... is greater, then greater is its ..... capacity. A) Solid, storage. B) Adsorbate, surface area. C) Adsorbate, adsorbent. D) Adsorbent, adsorption. Show Answer Correct Answer: D) Adsorbent, adsorption. 49. Water matching distilled water is obtained by using: A) Boiling. B) Zeolite process. C) Lime soda process. D) Ion exchange process. Show Answer Correct Answer: D) Ion exchange process. 50. When adsorption and absorption occurs simultaneously, this process called A) Adsorption. B) Absorption. C) Sorption. D) Desorption. Show Answer Correct Answer: C) Sorption. 51. Electrolyte excess in a colloidal system can be removed by ..... process A) Dialysis. B) Electrophoresis. C) Peptization. D) Ultrafiltration. Show Answer Correct Answer: A) Dialysis. 52. Colloids in which there is strong affinity between the dispersed phase and dispersion medium A) Lyophobic colloids. B) Lyophillic colloids. C) Both. D) None of the above. Show Answer Correct Answer: B) Lyophillic colloids. 53. Identify the positively charged colloid. A) Gold sol. B) As$_{2}$S$_{3}$. C) Haemoglobin. D) Clay. Show Answer Correct Answer: C) Haemoglobin. 54. Size smaller than 1nm are called A) Suspension. B) Heterosolution. C) Colloidal solution. D) True solution. Show Answer Correct Answer: D) True solution. 55. Another name of Calgon is A) Sodium alumino silicate. B) Sodium phosphate. C) Sodium hexa meta phosphate. D) Sodium hydroxide. Show Answer Correct Answer: C) Sodium hexa meta phosphate. 56. In the adsorption of acetic acid on charcoal the acetic acid is A) Inner phase. B) Absorbent. C) Adsorbate. D) Adsorbent. Show Answer Correct Answer: C) Adsorbate. 57. In gas masks which substance is used to absorb toxic gases and vapours? A) Coal powder. B) Wood charcoal. C) Activated charcoal. D) Animal charcoal. Show Answer Correct Answer: C) Activated charcoal. 58. Rough surface of an adsorbent has A) More active centres. B) More porus. C) Non porus. D) Less active centres. Show Answer Correct Answer: A) More active centres. 59. The process of settling of colloidal particle is called ..... A) Peptization. B) Caogulation. C) Emulsification. D) Dialysis. Show Answer Correct Answer: B) Caogulation. 60. Rate of physical adsorption increase with A) Decrease in pressure. B) Increase in temperature. C) Decrease in temperature. D) Decrease in surface area. Show Answer Correct Answer: C) Decrease in temperature. ← 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 4Class 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