This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Micelles behave as colloids only when? A) Concentration is less than CMC. B) Concentration is equal to CMC. C) Concentration is greater than CMC. D) They always behave as colloids. Show Answer Correct Answer: C) Concentration is greater than CMC. 2. Water vapours are A) Adsorbed by CaCl2. B) Absorbed by silica gel. C) Adsorbed by silica gel. D) All are correct. Show Answer Correct Answer: C) Adsorbed by silica gel. 3. The heat of physical adsorption is about: A) Zero. B) 20-40kj/mol. C) 200-500kj/mol. D) Very high. Show Answer Correct Answer: B) 20-40kj/mol. 4. 50) Temporary hardness can be removed by ..... & ..... A) Boiling & adding lime. B) Boiling & zeolite. C) Lime-soda & adding lime. D) Sodium zeolite &lime soda. Show Answer Correct Answer: A) Boiling & adding lime. 5. For which gas Extent of adsorption is maximum A) $NH_3$. B) $CO_2$. C) $CH_4$. D) $H_2$. Show Answer Correct Answer: A) $NH_3$. 6. Chromatography is used to separate different constituents present in a ..... A) Solid. B) Liquid. C) Gas. D) Mixture. Show Answer Correct Answer: D) Mixture. 7. The substance which behave like solute is A) Adsorbent. B) Adsorbate. C) Desorption. D) Sorption. Show Answer Correct Answer: B) Adsorbate. 8. # Fog is a colloidal system of A) Gas in liquid. B) Liquid in gas. C) Gas in gas. D) Gas in solid. Show Answer Correct Answer: B) Liquid in gas. 9. Which one is not a disadvantage of scale A) Wastage of fuel. B) Boiler explosion. C) Decrease in efficiency. D) Formation of wet steam. Show Answer Correct Answer: D) Formation of wet steam. 10. The extent of adsorption i.e. (x/m), where x is the mass of the adsorbate and m is the mass of the adsorbent, depends on the ..... A) Pressure. B) Temperature. C) Volume. D) Area. Show Answer Correct Answer: A) Pressure. 11. Dispersed phase and dispersion medium in fog? A) Liq and gas. B) Gas and liquid. C) Solid and gas. D) Gas and solid. Show Answer Correct Answer: A) Liq and gas. 12. A substance which concentrates at the surface is called A) Adsorbate. B) Adsorbent. C) Absorbent. D) Sorbent. Show Answer Correct Answer: A) Adsorbate. 13. In surface chemistry, what is adsorption? A) Absorption of substances into the bulk. B) Accumulation of substances at the surface or interface. C) Chemical reaction in solution. D) Evaporation of liquids. Show Answer Correct Answer: B) Accumulation of substances at the surface or interface. 14. Which of the following process is not responsible for the presence of electric charge on the sol particles? A) Electron capture by sol particles. B) Adsorption of ionic species from solution. C) Formation of Helmholtz electrical double layer. D) Absorption of ionic species from solution. Show Answer Correct Answer: D) Absorption of ionic species from solution. 15. When carbon dioxide is passed through lime water, the lime water becomes A) Milky. B) Shiny. C) Silvery. D) Golden yellow. Show Answer Correct Answer: A) Milky. 16. The stability of lyophobic sols is due to A) Adsorption of covalent molecules on the colloid. B) The size of the particles. C) The charge on particles. D) Tyndall effect. Show Answer Correct Answer: C) The charge on particles. 17. The formation of micelles takes place only above A) Inversion temperature. B) Boyle's temperature. C) Critical temperature. D) Kraft temperature. Show Answer Correct Answer: D) Kraft temperature. 18. Which of the following electrolytes will have maximum coagulating value for Agl/ $Ag^+$ A) $Na_2S$. B) $Na_3PO_4$. C) $Na_2SO_4$. D) NaCl. Show Answer Correct Answer: B) $Na_3PO_4$. 19. In Langmuir's model of adsorption of a gas on a solid surface A) The adsorption at a single site on the surface may involve multiple molecules at the same time. B) The mass of gas striking a given area of surface is proportional to the pressure of the gas. C) The mass of gas striking a given area of surface is independent of the pressure of the gas. D) The rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered. Show Answer Correct Answer: B) The mass of gas striking a given area of surface is proportional to the pressure of the gas. 20. Which of the following process is responsible for the formation of delta at a place where rivers meet the sea? A) Emulsification. B) Colloid formation. C) Coagulation. D) Peptisation. Show Answer Correct Answer: C) Coagulation. 21. Internal treatment of boiler feed water means: A) Treating water during evaporation itself. B) Treating water before boiler-feeding it. C) Treating chemicals directly into the boiler. D) Treating after some internal change in boiler designs. Show Answer Correct Answer: C) Treating chemicals directly into the boiler. 22. What type of colloid is formed when solid particles are dispersed in a liquid? A) Sol. B) Foam. C) Emulsion. D) Aerosol. Show Answer Correct Answer: A) Sol. 23. Fog is an example of which type of colloidal system? A) Gas in liquid. B) Solid in gasLiquid in gas. C) Gas in gas. D) Liquid in gas. Show Answer Correct Answer: B) Solid in gasLiquid in gas. 24. Which factor does NOT affect adsorption? A) Surface area of adsorbent. B) Temperature. C) Concentration of adsorbate. D) Color of adsorbent. Show Answer Correct Answer: D) Color of adsorbent. 25. What is dialysis in relation to colloids? A) Separation of colloidal particles by size exclusion. B) Heating of colloids. C) Adding surfactants. D) Evaporation process. Show Answer Correct Answer: A) Separation of colloidal particles by size exclusion. ← 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 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