This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Physical adsorption of a gaseous species may change to chemical adsorption with ..... A) Decrease in temperature. B) Increase in temperature. C) Increase in surface area of adsorbent. D) Decrease in surface area of adsorbent. Show Answer Correct Answer: B) Increase in temperature. 2. The exhausted permutit (zeolite) is regenerated by percolating through it a solution of: A) Calcium chloride. B) Zinc chloride. C) Magnesium chloride. D) Sodium chloride. Show Answer Correct Answer: D) Sodium chloride. 3. Activated charcoal is a good catalyst because it: A) Is made up of carbon atoms. B) Is very reactive. C) Has more adsorption power. D) Has inert nature towards reagents. Show Answer Correct Answer: C) Has more adsorption power. 4. # Froth floatation process for the concentration of ores is a practical application of A) Adsorption. B) Absorption. C) Coagulation. D) Sedimentation. Show Answer Correct Answer: A) Adsorption. 5. Colloid preparation from molecules or ions to form colloidal particles is called ..... A) Coagulation. B) Condensation. C) Mechanical dispersion. D) Peptization. Show Answer Correct Answer: B) Condensation. 6. Adsorption is a ..... process A) Exothermic process. B) Endothermic process. C) Both. D) None. Show Answer Correct Answer: A) Exothermic process. 7. 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) Catalytic conversion of water gas to methanol. D) Acid hydrolysis of methyl acetate. Show Answer Correct Answer: D) Acid hydrolysis of methyl acetate. 8. Peptisation is a process of A) Precipitation of colloid. B) Dispersion of precipitate. C) Purification of colloids. D) Movement of colloid under electric potential. Show Answer Correct Answer: B) Dispersion of precipitate. 9. Colloidion is 4% solution of which one of the following in alcohol-ether mixture. A) Nitroglycerin. B) Cellulose acetate. C) Glycol dinitrate. D) Nitrocellulose. Show Answer Correct Answer: D) Nitrocellulose. 10. Under which category is colloidal system? A) Homogeneous mixture. B) Heterogeneous mixture. C) Suspensions. D) True solution. Show Answer Correct Answer: B) Heterogeneous mixture. 11. 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. 12. When was the scientest that descovered brownian motion was born? A) 1978. B) 1778. C) 1773. D) 1858. Show Answer Correct Answer: C) 1773. 13. 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. 14. Milk is an example of a A) Solution. B) Colloid. C) Suspension. D) Solid. Show Answer Correct Answer: B) Colloid. 15. The coagulation values in millimoles per litre of the electrolyte for the coagulation of As$_{2}$S$_{3}$ sol are given .I NaCl (52) II. BaCl$_{2}$ (0.69)III. MgSO$_{4}$ IV. MgSO$_{4}$ (0.22) The correct order of coagulating power is A) I > II > III. B) II > I > III. C) III > II > I. D) III > I > II. Show Answer Correct Answer: C) III > II > I. 16. Sludge is A) Strong bubble. B) Wet steam. C) Loose precipitate. D) Strong coating. Show Answer Correct Answer: C) Loose precipitate. 17. Which one of the following will act as best protective colloid? A) Gelatin ( Gold no-0.005). B) Starch (Gold no-25). C) Gum arabic (Gold no-0.15). D) Egg Albumin (Gold no-0.08). Show Answer Correct Answer: A) Gelatin ( Gold no-0.005). 18. These are the properties of colloid.ElectrophoresisTyndall EffectCoagulationBrownian movementDialysisWhich number that is applied in purification of water using alum? A) 1. B) 2. C) 3. D) 4. E) 5. Show Answer Correct Answer: C) 3. 19. 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. 20. 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. 21. Lyophilic colloids is also called as A) Intrinsic Colloids. B) Extrinsic collids. C) Irreversible colloids. D) Emulsion. Show Answer Correct Answer: A) Intrinsic Colloids. 22. Extent of physisorption of a gas increases with ..... A) (i) increase in temperature. B) (ii) decrease in temperature. C) (iii) decrease in surface area of adsorbent. D) (iv) decrease in strength of van der Waals forces. Show Answer Correct Answer: B) (ii) decrease in temperature. 23. 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. 24. 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. 25. Select the colloids coagulated at anode during electrophoresis: A) As2S3. B) Milk. C) Blood. D) Basic Dye. Show Answer Correct Answer: A) As2S3. ← PreviousNext →Related 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 5Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 6Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 8Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 9Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 10Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books