This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the role of molybdenum in Haber's process for manufacture of ammonia? A) As a catalytic poison. B) As a catalytic promoter. C) As a catalyst. D) As a reactant. Show Answer Correct Answer: B) As a catalytic promoter. 2. A colloidal system having a solid substance as the dispersed phase and a liquid as the dispersion medium.Identify the colloidal type that best describes the system above. A) Gel. B) Emulsion. C) Solid Sol. D) Sol. Show Answer Correct Answer: D) Sol. 3. A catalyst increases the rate of the reaction because it A) Increases the activation energy. B) Lowers the energy barrier for reaction. C) Decreases the collision diameter. D) Increases the temperature co-efficient. Show Answer Correct Answer: B) Lowers the energy barrier for reaction. 4. What is foam? A) Solid is dispersed in gas. B) Gas is dispersed in solid. C) Gas is dispersed in liquid. D) Liquid is dispersed in liquid. Show Answer Correct Answer: C) Gas is dispersed in liquid. 5. Which of the following is not the characteristic of catalyst? A) It changes equilibrium point. B) It initiate the reaction. C) It alters the rate of a reaction. D) It increases the average K.E of molecule. Show Answer Correct Answer: C) It alters the rate of a reaction. 6. Galvanisation is process used to prevent the rusting of which of the following? A) Iron. B) Zinc. C) Aluminium. D) Copper. Show Answer Correct Answer: A) Iron. 7. Assertion:A gas with higher critical temperature gets adsorbed to more extent than a gas with lower critical temperature.Reason:The easily liquifiable gases get adsorbed to more extent. A) Assertion is true but the reason is false. B) Assertion is false but the reason in true. C) Both assertion and reason are true and the reason is a correct explanation of assertion. D) If both assertion and reason are true but reason is not a correct explanation of assertion. Show Answer Correct Answer: C) Both assertion and reason are true and the reason is a correct explanation of assertion. 8. Water containing dissolved salts with a peculiar salty taste is called: A) Soft water. B) Brackish water. C) Hard water. D) Desalinated water. Show Answer Correct Answer: B) Brackish water. 9. Select the incorrect statement from the following options. A) In the micelle formation, the water soluble heads are directed towards the centre. B) In the micelle formation, the water soluble heads are on the surface in contact with the water. C) In the micelle formation, the water insoluble tails are directed towards the centre. D) None of the mentioned. Show Answer Correct Answer: A) In the micelle formation, the water soluble heads are directed towards the centre. 10. Which of the following is not applicable for chemisorption A) Its heat of adsorption is high. B) Its takes place at high temperature. C) It is reversible. D) It forms unimolecular layer. Show Answer Correct Answer: C) It is reversible. 11. Chemical used in regeneration of cation exchange resin A) CaCO3. B) HCl. C) NaOH. D) MgCl2. Show Answer Correct Answer: B) HCl. 12. 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 . 13. The gold numbers of protective colloids A, B, C and D are 0.04, 0.004, 10 and 40 respectively. The protective powers of A, B, C, D are in the order: A) A>B>C>D. B) B>A>C>D. C) D>C>A>B. D) D>C>B>A. Show Answer Correct Answer: B) B>A>C>D. 14. Dispersion method is used to produce colloid from suspension. Which process is not dispersion method? A) Mechanical dispersion. B) Hydrolysis. C) Bredig's Arch method. D) Peptization. Show Answer Correct Answer: B) Hydrolysis. 15. 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. 16. The curve showing the variation of adsorption with pressure at constant temperature is called: A) Adsorption isotherm. B) Adsorption isobars. C) An isosters. D) Absorption isobars. Show Answer Correct Answer: A) Adsorption isotherm. 17. At high concentration of soap in water, soap behave as A) (a) molecular colloid. B) (b) associated colloid. C) (c) macromolecular collloid. D) Lyophilic colloid. Show Answer Correct Answer: B) (b) associated colloid. 18. 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. 19. It is a process of removing a dissolved substance from a colloidal solution by means of diffusion through a suitable membrane A) Electrophoresis. B) Dialysis. C) Precipitation. D) Peptization. Show Answer Correct Answer: B) Dialysis. 20. 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. 21. 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. 22. 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. 23. 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. 24. 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. 25. Which of the following is an example of cationic detergent? A) Alkyltrimethyl ammonium chloride. B) Sodium salts of alkyl sulphates. C) Sodium salts of alkyl benzene sulphonic acids. D) Polyethers. Show Answer Correct Answer: A) Alkyltrimethyl ammonium chloride. ← 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 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