This quiz works best with JavaScript enabled. Home > Class 12 > 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 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as A) Foam. B) Sol. C) Emulsion. D) Gel. Show Answer Correct Answer: D) Gel. 2. Which of the following is NOT an example of a colloid? A) Milk. B) Fog. C) Saltwater solution. D) Gelatin. Show Answer Correct Answer: C) Saltwater solution. 3. 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. 4. 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. 5. .Most micelles are spherical and contain between ..... surfactant monomers A) 0-50. B) 50-100. C) 150-200. D) 1500-2000. Show Answer Correct Answer: B) 50-100. 6. When FeCl$_{3}$ solution is added to NaOH a negatively charged colloidal solution is obtained. It is due to: A) Presence of basic group. B) Preferential adsorption of OH-ions. C) Self dissociation. D) Electron capture by solution particles. Show Answer Correct Answer: B) Preferential adsorption of OH-ions. 7. What is the value of R in calK$^{-1}$mol$^{-1}$ A) 8.314. B) 0.0821. C) 8.314*10$^{7}$. D) 1.987. Show Answer Correct Answer: D) 1.987. 8. Chemical not used in EDTA method A) EBT. B) Ammonia buffer. C) Standard hard water. D) CH3COOH. Show Answer Correct Answer: D) CH3COOH. 9. Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ sol? A) $Na_2S$. B) $Na_3PO_4$. C) $Na_2SO_4$. D) NaCl. Show Answer Correct Answer: B) $Na_3PO_4$. 10. Colloids have great affinity of dispersion medium? A) Lipophilic colloids. B) Lyophobic colloids. C) Hydroponic colloids. D) Hydrophilic colloids. Show Answer Correct Answer: A) Lipophilic colloids. 11. The minimum temperature required for formation of associated colloid is called ..... A) Critical temperature. B) Inversion temperature. C) Kraft temperature. D) Boyle's temperature. Show Answer Correct Answer: C) Kraft temperature. 12. Which of the following not form a macromolecular colloids in water A) Starch. B) Sodium stearate. C) Nylon. D) Enzyme. Show Answer Correct Answer: B) Sodium stearate. 13. Which of the following electrolytes will have maximum coagulating value for AgI/Ag$^{+}$ sol? (AgI/Ag+ implies positive sol) A) $Na_2S$. B) NaCl. C) $Na_3PO_4$. D) $Na_2SO_4$. Show Answer Correct Answer: C) $Na_3PO_4$. 14. Reason for temporary hardness A) CaSO$_{4}$. B) MgCl$_{2}$. C) MgSO$_{4}$. D) CaCO$_{3}$. Show Answer Correct Answer: D) CaCO$_{3}$. 15. What is the name of the boundary layer surrounding a colloidal particle? A) Surface tension. B) Electrical double layer. C) Adsorption layer. D) Micelle. Show Answer Correct Answer: B) Electrical double layer. 16. 'Greater the valency, the higher is the ciagulating power of ion'. This rule was introduced by A) Hardy Schulz. B) Maxwell. C) Hardy Lewis. D) Faraday. Show Answer Correct Answer: A) Hardy Schulz. 17. The dispersion medium in cloud is A) Solid. B) Liquid. C) Gas. D) Water. Show Answer Correct Answer: C) Gas. 18. 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. 19. Which of the following will show Tyndall effect? A) Aqueous solution of soap below critical micelle concentration. B) Aqueous solution of soap above critical micelle concentration. C) Aqueous solution of sodium chloride. D) Aqueous solution of sugar. Show Answer Correct Answer: B) Aqueous solution of soap above critical micelle concentration. 20. What is an ideal gas A) A gas obeys the gas laws. B) A gas does not obey the gas laws. C) A gas obeys only the Boyle's law. D) A gas which doesn't obey the Charles' law. Show Answer Correct Answer: A) A gas obeys the gas laws. 21. Which is the example of hydrophilic colloid? A) Milk. B) Gel. C) Gold sol. D) Mayonnaise. Show Answer Correct Answer: B) Gel. 22. Which of the following statement is correct regarding chemical adsorption? A) It forms monolayer. B) It is reversible in nature. C) It occurs at low temperature. D) It is not specific in nature. Show Answer Correct Answer: B) It is reversible in nature. 23. 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. 24. How are colloidal solutions of gold prepared by different colours? A) Different diameters of colloidal gold particles. B) Variable valency of gold. C) Different concentration of gold particles. D) Impurities produced by different methods. Show Answer Correct Answer: A) Different diameters of colloidal gold particles. 25. Define adsorbate. A) The removal of adsorbed particles. B) A solid material on which adsorption occurs. C) A substance in the adsorbed phase. D) The study on the interaction phenomena on the surface. Show Answer Correct Answer: C) A substance in the adsorbed phase. ← 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 5Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 6Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 7Class 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