This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 11 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The best coagulant for the precipitation of Fe(OH)$_{3}$ sol is A) Na$_{2}$HPO$_{3}$. B) NaNO$_{3}$. C) Na$_{3}$PO$_{4}$. D) Na$_{2}$SO$_{4}$. Show Answer Correct Answer: C) Na$_{3}$PO$_{4}$. 2. Which one is not a unit of hardness? A) Ppm. B) Mg/L. C) Degree Clarke. D) Kelvin. Show Answer Correct Answer: D) Kelvin. 3. Adsorption of gases on solid surface is generally exothermic because A) Enthalpy is positive. B) Entropy decreases. C) Entropy increases. D) Free energy increases. Show Answer Correct Answer: B) Entropy decreases. 4. Which type of colloid has liquid dispersed in a gas? A) Foam. B) Sol. C) Gel. D) Emulsion. Show Answer Correct Answer: A) Foam. 5. Adsorption is a surface phenomenon A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 6. Zig Zag movement of colloidal particles is known as A) Brownian motion. B) U Brownian motion. C) Both. D) None of the above. Show Answer Correct Answer: A) Brownian motion. 7. The gas molecules or atoms held to the solid surfaces by a chemical bond are called A) Chemisorption. B) Physiorption. C) Adsorption. D) Adsorption. Show Answer Correct Answer: A) Chemisorption. 8. When did the scintest that descovered browain motion? A) 1856. B) 1858. C) 1987. D) 1989. Show Answer Correct Answer: B) 1858. 9. Which of the following statements is incorrect regarding physisorption? A) It occurs because of van der Walls forces. B) More easily liquefiable gases are adsorbed readily. C) Under high pressure it results into multimolecular layer on adsorbent surface. D) Enthalpy of adsorption ($\Delta$H$_{adsorption}$) is low and positive. Show Answer Correct Answer: D) Enthalpy of adsorption ($\Delta$H$_{adsorption}$) is low and positive. 10. A graph between the amount of the gas adsorbed per gram of the adsorbent and the equilibrium pressure of the adsorbate at constant at constant temperature is called A) Adsorption isotherm. B) Adsorption isobar. C) Both. D) None of the above. Show Answer Correct Answer: A) Adsorption isotherm. 11. Adsorption is a A) Bulk phenomena. B) Surface phenomena. C) Both. D) None of these. Show Answer Correct Answer: B) Surface phenomena. 12. Recognize the method in preparing lyophilic sol. A) Chemical reduction. B) Peptization. C) Mechanical dispersion. D) Direct mixing of the solid with the liquid. Show Answer Correct Answer: D) Direct mixing of the solid with the liquid. 13. Hardness is represented as A) Calcium carbonate equivalent. B) Magnesium carbonate equivalent. C) Calcium sulphate equivalent. D) Sodium carbonate equivalent. Show Answer Correct Answer: A) Calcium carbonate equivalent. 14. Which gas is adsorbed strongly be charcoal A) CO. B) N$_{2}$. C) H$_{2}$. D) O$_{2}$. Show Answer Correct Answer: A) CO. 15. Which of the following colloidal system represents a gel? A) Solid in liquid. B) Solid in gas. C) Liquid in solid. D) Liquid in gas. Show Answer Correct Answer: C) Liquid in solid. 16. A biological catalyst is: A) An amino acid. B) A nitrogenous organic compound. C) An enzyme. D) A carbohydrate. Show Answer Correct Answer: C) An enzyme. 17. Sodium laurel Sarcosinate is an example of ..... A) Anionic surfactants. B) Cationic surfactants. C) Non-ionic surfactants. D) Zwitter ionic surfactants. Show Answer Correct Answer: A) Anionic surfactants. 18. The mathematical expression for adsorption given by Freundlich is A) X/m =kP. B) X/n = kP. C) X/m = kP1/n. D) S/m = kPn. Show Answer Correct Answer: C) X/m = kP1/n. 19. Converting a freshly prepared substance into colloidal state by shaking with a suitable electrolyte A) Peptization. B) Coagulation. C) Precipitation. D) Flocculation. Show Answer Correct Answer: A) Peptization. 20. Movement of dispersion medium under the influence of electronic field is called as- A) Electro-osmosis. B) Electrophoresis. C) Electrodialysis. D) Cataphoresis. Show Answer Correct Answer: A) Electro-osmosis. 21. 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. 22. 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. 23. 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. 24. The protective power of lyophilic colloidal sol is expressed in terms of A) Coagulation value. B) Gold number. C) CMC (Critical Micelle Concentration). D) Oxidation numbers. Show Answer Correct Answer: B) Gold number. 25. Which of the following is correct about lyophilic sol? A) They are irreversible. B) They are formed by inorganic Substance. C) They are readily coagulated by addition of electrolyte. D) They are self-stabilised. Show Answer Correct Answer: D) They are self-stabilised. ← 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 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 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books