This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry – Quiz 14 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 5 Surface Chemistry Quiz 14 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. 22) If the water containing hardness, gives wine red colour with Eriochrome Black-T indicator at pH 9-10. A) Wine-red. B) Steel Blue. C) Green. D) Yellow. Show Answer Correct Answer: B) Steel Blue. 3. 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. 4. Colloidal Conditioning is ..... A) Na2(Na4(PO3)6. B) Na3PO4. C) Kerosene, agar-agar, gelatin, glue. D) NaAlO2. Show Answer Correct Answer: C) Kerosene, agar-agar, gelatin, glue. 5. A chemical which can simultaneously act as coagulant and softening agent is: A) Alum. B) Soda. C) Sodium aluminate. D) Lime. Show Answer Correct Answer: C) Sodium aluminate. 6. Sol Fe(OH)$_{3 }$synthesis is carried out by ..... A) Mechanical dispersion. B) Peptization. C) Double decomposition. D) Hydrolysis. Show Answer Correct Answer: D) Hydrolysis. 7. Colloidal particles of soap sol in water is: A) Negatively charged. B) Neutral. C) Positively charged. D) Unpredictable. Show Answer Correct Answer: A) Negatively charged. 8. 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. 9. Gold number is a measure of A) Stability of colloidal system. B) Coagulation power of a colloid. C) Size of colloidal particles. D) Efficiency of the protective colloid. Show Answer Correct Answer: D) Efficiency of the protective colloid. 10. Which one is the example of colloidal system when solid is dispersed in gas? A) Fog. B) Foam. C) Smoke. D) Pumice stone. Show Answer Correct Answer: C) Smoke. 11. 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. 12. Electric Double layer A) Zeta potential layer. B) Diffuse layer. C) Stern layer + Diffuse layer. D) Stern layer. E) Diffuse layer + Zeta potential. Show Answer Correct Answer: C) Stern layer + Diffuse layer. 13. WHICH OF THE FOLLOWING IS NOT APPLICABLE TO THE PHENOMENON OF ADSORPTION A) DELTA H > 0. B) DELTA G <0. C) DELTA S <0. D) DELTA H < 0. Show Answer Correct Answer: A) DELTA H > 0. 14. The gas which is least adsorbed on charcoal is A) HCl. B) O$_{2}$. C) CO$_{2}$. D) NH$_{3}$. 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) 0.4. B) 0.64. C) 2.4. D) 0.052. E) Non of these. Show Answer Correct Answer: C) 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 moles in that solution. B) A measure of the the number of ions in that solution. C) A measure of the concentration of ions in that solution. D) A measure of the ions solubility. Show Answer Correct Answer: C) 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) Antioxidant. B) Emulsifier/Surfactant. C) Preservative. D) Colouring agent. Show Answer Correct Answer: B) Emulsifier/Surfactant. 20. Tyndall effect occurs when the colloidal particle ..... A) Adsorbs the light. B) Passes the light. C) Scatters the light. D) Is able to do brownian motion. 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 bicarbonate. B) Calcium chloride. C) Magnesium carbonate. D) Calcium carbonate. Show Answer Correct Answer: D) Calcium carbonate. 22. What is the form of van der Waal's equation at high pressures A) PV=nRT. B) P(V-b)=RT. C) (P+a/V$^{2}$)(V-b)=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 desorption. C) Molar enthalpy of adsorption. D) Entropy of adsorption. Show Answer Correct Answer: C) Molar enthalpy of adsorption. ← 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