This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part I > 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 (45 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following statements are correct about solid catalyst? A) Catalytic activity of a solid catalyst does not depend upon the strength of chemisorption. B) Catalyst does not change $\Delta$H of reaction. C) Catalyst is required in large quantities to catalyse reactions. D) Catalytic activity depends upon temperature. Show Answer Correct Answer: B) Catalyst does not change $\Delta$H of reaction. 2. Which one is most effective for the coagulation of Fe(OH)3 sol A) Na3PO4. B) Na2SO4. C) NaCl. D) None of the above. Show Answer Correct Answer: A) Na3PO4. 3. 22) If the water containing hardness, gives wine red colour with Eriochrome Black-T indicator at pH 9-10. A) Yellow. B) Steel Blue. C) Wine-red. D) Green. Show Answer Correct Answer: B) Steel Blue. 4. The extent of physical adsorption: A) Increases with rise of temperature. B) Decreases with rise of temperature. C) Is independent of temperature. D) First increases with rise in temperature up to a critical value and then decreases. Show Answer Correct Answer: B) Decreases with rise of temperature. 5. Colloidal Conditioning is ..... A) NaAlO2. B) Na2(Na4(PO3)6. C) Kerosene, agar-agar, gelatin, glue. D) Na3PO4. Show Answer Correct Answer: C) Kerosene, agar-agar, gelatin, glue. 6. A chemical which can simultaneously act as coagulant and softening agent is: A) Alum. B) Sodium aluminate. C) Soda. D) Lime. Show Answer Correct Answer: B) Sodium aluminate. 7. Sol Fe(OH)$_{3 }$synthesis is carried out by ..... A) Hydrolysis. B) Double decomposition. C) Mechanical dispersion. D) Peptization. Show Answer Correct Answer: A) Hydrolysis. 8. Colloidal particles of soap sol in water is: A) Unpredictable. B) Positively charged. C) Negatively charged. D) Neutral. Show Answer Correct Answer: C) Negatively charged. 9. Which of the statement is correct regarding physical adsorption? A) It is irreversible. B) The forces between adsorbate and adsorbent are strong forces. C) It forms multimolecular layers. D) It is specific in nature. Show Answer Correct Answer: C) It forms multimolecular layers. 10. Gold number is a measure of A) Efficiency of the protective colloid. B) Coagulation power of a colloid. C) Stability of colloidal system. D) Size of colloidal particles. Show Answer Correct Answer: A) Efficiency of the protective colloid. 11. Which one is the example of colloidal system when solid is dispersed in gas? A) Pumice stone. B) Smoke. C) Foam. D) Fog. Show Answer Correct Answer: B) Smoke. 12. Physisorption is held by A) Covalent forces. B) Chemical forces. C) Vander Waal forces. D) Centrifugal forces. Show Answer Correct Answer: C) Vander Waal forces. 13. Electric Double layer A) Stern layer. B) Diffuse layer. C) Zeta potential layer. D) Diffuse layer + Zeta potential. E) Stern layer + Diffuse layer. Show Answer Correct Answer: E) Stern layer + Diffuse layer. 14. The gas which is least adsorbed on charcoal is A) CO$_{2}$. B) O$_{2}$. C) NH$_{3}$. D) HCl. Show Answer Correct Answer: B) O$_{2}$. 15. Kc = 0.040 for the system below at 450oC:PCl5(g) = PCl3(g) + Cl2(g)Evaluate Kp for the reaction at 450oC. A) 2.4. B) 0.4. C) 0.052. D) 0.64. E) Non of these. Show Answer Correct Answer: A) 2.4. 16. The movement of the dispersion medium under the influence of applied potential is known as A) Osmosis. B) Electro-osmosis. C) Electrophoresis. D) None of these. Show Answer Correct Answer: B) Electro-osmosis. 17. Take a look at the following properties.Able to adsorb ionscatters the lightthe particles move randomlyAbe to have chargeWhich are the colloidal properties? A) 1, 2, and 3. B) 1 and 3. C) 2 and 4. D) All corrects. Show Answer Correct Answer: D) All corrects. 18. The ionic strength of solution is A) A measure of the concentration of ions in that solution. B) A measure of the moles in that solution. C) A measure of the ions solubility. D) A measure of the the number of ions in that solution. Show Answer Correct Answer: A) A measure of the concentration of ions in that solution. 19. A substance that allows oil and water to mix or emulsify is known as ..... A) Colouring agent. B) Antioxidant. C) Preservative. D) Emulsifier/Surfactant. Show Answer Correct Answer: D) Emulsifier/Surfactant. 20. Tyndall effect occurs when the colloidal particle ..... A) Passes the light. B) Is able to do brownian motion. C) Scatters the light. D) Adsorbs the light. Show Answer Correct Answer: C) Scatters the light. 21. 49) The concentration of hardness causing ions are usually expressed in terms of an equivalent amount of A) Calcium chloride. B) Calcium bicarbonate. C) Calcium carbonate. D) Magnesium carbonate. Show Answer Correct Answer: C) Calcium carbonate. 22. What is the form of van der Waal's equation at high pressures A) (P+a/V$^{2}$)(V-b)=nRT. B) P(V-b)=RT. C) PV=nRT. D) Continuity of state. Show Answer Correct Answer: B) P(V-b)=RT. 23. Hey Avni, Asher, and Sneha! Let's dive into the exciting world of chemistry! Can you explain why surface area is so important in chemical reactions? A) Surface area has no effect on reaction rates. B) Increasing surface area decreases the number of collisions. C) Surface area only affects solid reactants, not liquids or gases. D) Surface area increases the rate of chemical reactions by allowing more collisions between reactants. Show Answer Correct Answer: D) Surface area increases the rate of chemical reactions by allowing more collisions between reactants. 24. In ..... catalysis state of reactants and catalyst is different A) Homogeneous. B) Heterogeneous. C) Both. D) None. Show Answer Correct Answer: B) Heterogeneous. 25. The amount of heat evolved when one mole of a gas is adsorbed on a solid surface is called as A) Molar enthalpy of absorption. B) Molar enthalpy of adsorption. C) Entropy of adsorption. D) Molar enthalpy of desorption. Show Answer Correct Answer: B) Molar enthalpy of adsorption. 26. The following is the colloid synthesis.metal solFe(OH)$_{3}$ solAs$_{2}$S$_{3}$ solSulphur solAgCl solWhich are occupying condensation method? A) 1, 2, 4. B) 2, 3, 4. C) 1, 4, 5. D) 1, 3, 4. Show Answer Correct Answer: B) 2, 3, 4. 27. In Freundlich adsorption isotherm, at saturation pressure, the rate of adsorption becomes equal to the rate of ..... A) Absorption. B) Desorption. C) Activation. D) Sorption. Show Answer Correct Answer: B) Desorption. 28. A plot of log vs log p for adsorption of gas on a solid gives in straight line with slope equal to A) 1/n. B) -logk. C) Logk. D) N. Show Answer Correct Answer: A) 1/n. 29. The correct ascending order of adsorption of the following gases on the same mass of charcoal at same temperature and pressure is A) H$_{2}$ < SO$_{2}$ < CH$_{4}$. B) CH$_{4}$ < H$_{2}$ < SO$_{2}$. C) H$_{2}$ < CH$_{4}$ < SO$_{2}$. D) SO$_{2}$ < CH$_{4}$ < H$_{2}$. Show Answer Correct Answer: C) H$_{2}$ < CH$_{4}$ < SO$_{2}$. 30. What type of adsorption involves weak van der Waals forces? A) Chemisorption. B) Electrostatic adsorption. C) Physisorption. D) Ion exchange. Show Answer Correct Answer: C) Physisorption. 31. The gold number of gelatin is 0.01. Calculate the amount of gelatin to be added to 1000 mL of a colloid sol of gold to prevent its coagulation before adding 1 mL of 10 percent NaCl sol. A) 5mg. B) 4mg. C) 2mg. D) 1mg. Show Answer Correct Answer: D) 1mg. 32. ..... is used as a decolouriser inthe manufacture of canesugar. A) Alumina. B) Ceramic powder. C) Silica gel. D) Animal charcoal. Show Answer Correct Answer: D) Animal charcoal. 33. Example for physisorption A) Adsorption of H$_{2}$ on nickel. B) Adsorption of C$_{2}$H$_{5}$OH$_{ }$on nickel. C) Adsorption of O$_{2}$ on tungsten. D) Adsorption of N$_{2}$ on mica. Show Answer Correct Answer: D) Adsorption of N$_{2}$ on mica. 34. On the basis of data given below predict which of the following gases shows least adsorption on a definite amount of charcoal?Gas-CO2, SO2, CH4, H2 Critical temp./K 304, 630, 190, 33 respectively A) SO$_{2}$. B) H$_{2}$. C) CO$_{2}$. D) CH$_{4}$. Show Answer Correct Answer: A) SO$_{2}$. 35. If the substance is uniformly distributed throughout the body of a solid or a liquid, then it is called A) Chemisorption. B) Physiorption. C) Absorption. D) Adsorption. Show Answer Correct Answer: C) Absorption. 36. The adsorption due to gas molecules being held to the solid surface by vander waal's attractive forces is called A) Physical adsorption. B) Chemisorption. C) Absorption. D) Chemical adsorption. Show Answer Correct Answer: A) Physical adsorption. 37. The formation of micelles which occurs only beyond a certain temperature is called A) Critical temperature. B) Kraft Temperature. C) Micelle temperature. D) Critical sol temperature. Show Answer Correct Answer: B) Kraft Temperature. 38. Hey Shreya, have you ever wondered what role surfactants play in surface chemistry? Let's dive into the bubbly world of chemistry! A) Surfactants lower surface tension and enhance wetting and emulsification in surface chemistry. B) Surfactants have no impact on emulsification processes. C) Surfactants are used solely for cleaning purposes without affecting surface properties. D) Surfactants increase surface tension and reduce wetting. Show Answer Correct Answer: A) Surfactants lower surface tension and enhance wetting and emulsification in surface chemistry. 39. What is the Tyndall effect? A) Scattering of light by colloidal particles. B) Reflection of light by surfaces. C) Absorption of light by solution. D) Refraction of light in water. Show Answer Correct Answer: A) Scattering of light by colloidal particles. 40. Which of following is incorrect statement(s)? A) Colloidal sol shows brownian movement due to same charge on DP particles. B) In lyophobic, surface tension of Sol is same as medium. C) In lyophilic, surface tension of Sol is lesser than medium. D) Colloidal sol shows brownian motion due to different charge on DP particles. Show Answer Correct Answer: D) Colloidal sol shows brownian motion due to different charge on DP particles. 41. Brown colour of the apple after cutting is A) Chemical change. B) Physical change. C) Biological change. D) No change. Show Answer Correct Answer: A) Chemical change. 42. Which is not true for chemisorption? A) It involves chemical bond formation. B) It is highly specific. C) It involves high activation energy. D) It is reversible. Show Answer Correct Answer: D) It is reversible. 43. Formation of micelles takes place only above a particular concentration, known as A) Critical micelles concentration. B) Normal concentration. C) Both. D) None of the above. Show Answer Correct Answer: A) Critical micelles concentration. 44. Which of the following process does not occur at the interface of phases? A) Crystallisation. B) Heterogenous catalysis. C) Homogeneous catalysis. D) Corrosion. Show Answer Correct Answer: C) Homogeneous catalysis. 45. A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to A) 1/n. B) Log K. C) N. D) -log K. Show Answer Correct Answer: A) 1/n. ← PreviousRelated QuizzesScience QuizzesClass 12 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 1 Solid State QuizClass 12 Chemistry (Part I) Chapter 2 Solutions QuizClass 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books