This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 2 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. At the equilibrium position in the process of adsorption ..... A) $\Delta$H > 0. B) $\Delta$H = T$\Delta$S. C) $\Delta$H > T$\Delta$S. D) $\Delta$H < T$\Delta$S. Show Answer Correct Answer: B) $\Delta$H = T$\Delta$S. 2. A colloidal system having a solid substance as a dispersed phrase and a liquid as a dispersion medium is classified as A) Solid sol. B) Gel. C) Emulsion. D) Sol. Show Answer Correct Answer: D) Sol. 3. Dalton's Law is applicable for A) Non reacting gases. B) Reacting gases. C) Any gas. D) Air. Show Answer Correct Answer: A) Non reacting gases. 4. It has been observed that ..... gases are more adsorbed than ..... gas. A) Permanent gas, easily liquifiable gas. B) Temporary gas, permanent gas. C) Easily liquefiable gas, permanent gas. D) Permanent gas, temporary gas. Show Answer Correct Answer: C) Easily liquefiable gas, permanent gas. 5. The value of the compressibility factor (Z) for an ideal gas is equal to A) R. B) 1.5 R. C) 2. D) 1. Show Answer Correct Answer: D) 1. 6. 21) Permanent hardness is removed by using ..... A) Lime. B) Lime-soda. C) Boiling treatment. D) None of these. Show Answer Correct Answer: B) Lime-soda. 7. Multimolecular layer of adsorption takes place in A) Physical adsorption. B) Chemical adsorption. C) Both. D) None of the above. Show Answer Correct Answer: A) Physical adsorption. 8. Absorption is a A) Bulk phenomena. B) Surface phenomena. C) Both. D) None of these. Show Answer Correct Answer: A) Bulk phenomena. 9. Soaps essentially form a colloidal solution in water and remove the greasy matter by A) Coagulation. B) Emulsification. C) Adsorption. D) Absorption. Show Answer Correct Answer: B) Emulsification. 10. Brackish water can be purified using: A) Lime-soda method. B) Permuit process. C) Reverse osmosis method. D) None of these. Show Answer Correct Answer: C) Reverse osmosis method. 11. What causes the stability of lyophobic colloids? A) Large particle size. B) Electrical charge on particle surface. C) High temperature. D) Adding electrolytes. Show Answer Correct Answer: B) Electrical charge on particle surface. 12. Softening of ..... by the ion exchange principle isbased on the adsorption of cations. A) Ground water. B) Drinking water. C) Hard water. D) Sea water. Show Answer Correct Answer: C) Hard water. 13. The amount of heat evolved when 1 mole of any gas is adsorged on a solid adsorbent surface is called A) A. Entropy. B) B. enthalpy. C) C; heat of reaction. D) D. enthalpy of adsorption. Show Answer Correct Answer: D) D. enthalpy of adsorption. 14. When a small amount of FeCl3 is added to a freshly precipitated Fe(OH)3, b reddish brown colloidal solution is obtained. This phenomenon is known as A) Dialysis. B) Peptization. C) Protection. D) Dissolution. Show Answer Correct Answer: C) Protection. 15. Liquid in liquid sol is A) Gel. B) Emulsion. C) Sol. D) Foam. Show Answer Correct Answer: B) Emulsion. 16. 18) Universal solvent is ..... A) Water. B) Benzene. C) Alcohol. D) Ether. Show Answer Correct Answer: A) Water. 17. According to adsorption theory of catalysis, the speed of the reaction increases because A) The concentration of the reactant molecules at the active centres of the catalyst becomes high due to adsorption. B) In the process of adsorption, the activation energy of the molecules becomes large. C) Adsorption produces heat which increases the speed of the reaction. D) Adsorption lowers the activation energy of the reaction. Show Answer Correct Answer: D) Adsorption lowers the activation energy of the reaction. 18. Which of the following is an example of associated colloids? A) Sodium lauryl sulphate. B) Sodium stearate. C) Sodium palmitate. D) All of above. Show Answer Correct Answer: D) All of above. 19. Which one of the following characteristics is associated with adsorption? A) $\Delta$G and $\Delta$H are negative but $\Delta$S is positive. B) $\Delta$G and $\Delta$S are negative but $\Delta$H is positive. C) $\Delta$G is negative but $\Delta$H and $\Delta$S are positive. D) $\Delta$G, $\Delta$H and $\Delta$S all are negative. Show Answer Correct Answer: D) $\Delta$G, $\Delta$H and $\Delta$S all are negative. 20. In physical adsorption, gas molecules are bound on the solid surface by A) Chemical forces. B) Electrostatic forces. C) Gravitational forces. D) Vanderwaal forces. Show Answer Correct Answer: D) Vanderwaal forces. 21. Extent of plysisorption of a gas increases with ..... A) Increase in temperature. B) Decrease in temperature. C) Decrease in surface area of adsorbent. D) Decrease in strength of van der Waals forces. Show Answer Correct Answer: B) Decrease in temperature. 22. The process of removing extra common salt from water is called: A) Deionization. B) Softening. C) Disinfections. D) Desalination. Show Answer Correct Answer: D) Desalination. 23. Which of the following is not a favourable condition for physical adsorption? A) High pressure. B) Negative $\Delta$. C) Higher critical temperature of adsorbate. D) High temperature. Show Answer Correct Answer: D) High temperature. 24. Activated charcoal is used to remove coloring matter from pure substances. It works by ..... A) Sorption. B) Absorption. C) Adsorption. D) Bleaching. Show Answer Correct Answer: C) Adsorption. 25. Method by which lyophobic sol can be protected. A) By addition of oppositely charged sol. B) By addition of an electrolyte. C) By addition of lyophilic sol. D) By boiling. Show Answer Correct Answer: C) By addition of lyophilic sol. ← PreviousNext →Related QuizzesClass 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 1Class 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 10Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books