Class 12 Chemistry Chapter 5 Surface Chemistry MCQ Questions with Answers

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Surface Chemistry Class 12 Chemistry MCQ Questions with Answers

Class 12 Chemistry MCQ with answers are given here to chapter Surface Chemistry. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 12 Chemistry syllabus. By Solving these Class 12 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 12 Annual exam.

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Question 1. If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process?
(a) x/m = f (p) at constant T
(b) x/m = f (T) at constant p
(c) p = f (T) at constant (x/m)
(d) x/m = p ×T 

Question 2. Which one of the following characteristics is associated with adsorption?
(a) DG and DH are negative but DS is positive.
(b) DG and DS are negative but DH is positive.
(c) DG is negative but DH and DS are positive.
(d) DG, DH and DS all are negative.

Question 3. In Freundlich adsorption isotherm, the value of 1/n is
(a) between 0 and 1 in all cases
(b) between 2 and 4 in all cases
(c) 1 in case of physical absorption
(d) 1 in case of chemisorption. 

Question 4. 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) log k
(b) –log k
(c) n
(d) 1/n 

Question 5. Which is not correct regarding the adsorption of a gas on surface of a solid?
(a) On increasing temperature adsorption increases continuously.
(b) Enthalpy and entropy change is negative.
(c) Adsorption is more for some specific substance.
(d) It is a reversible reaction.

Question 6. The Langmuir adsorption isotherm is deduced using the assumption
(a) the adsorption sites are equivalent in their ability to adsorb the particles
(b) the heat of adsorption varies with coverage
(c) the adsorbed molecules interact with each other
(d) the adsorption takes place in multilayers.

Question 7. The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called
(a) maltase
(b) lipase
(c) zymase
(d) pepsin.

Question 8. Which one of the following statements is not correct?
(a) The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium.
(b) Enzymes catalyse mainly biochemical reactions.
(c) Coenzymes increase the catalytic activity of enzyme.
(d) Catalyst does not initiate any reaction.

Question 9. Which one of the following statements is incorrect about enzyme catalysis?
(a) Enzymes are mostly proteinous in nature.
(b) Enzyme action is specific.
(c) Enzymes are denatured by ultraviolet rays and at high temperature.
(d) Enzymes are least reactive at optimum temperature.

Question 10. In a chemical reaction, catalyst 
(a) decreases the energy of activation
(b) increases the energy of activation
(c) does not change energy of activation
(d) None of the above       

Question 11. According to the adsorption theory of catalysis, the speed of the reaction increases because
(a) the concentration of 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.

Question 12. Which of the following reaction requires catalyst?
(a) S + O₂ → SO₂
(b) C + O₂ → CO₂
(c) 2SO₂ + O₂ → 2SO₃
(d) All of the above       

Question 13. A catalyst 
(a) lowers the activation energy
(b) changes the rate constant
(c) changes the product
(d) itself destroys in the reaction       

Question 14. Assertion (A) Catalyst increases the rate of a reaction. 
Reason (R) In presence of a catalyst, the activation energy of the reaction increases. The correct answer is 
(a) Both A and R are correct and R is the correct explanation of A
(b) Both A and R are correct but R is not the correct explanation of A
(c) A is correct but R is incorrect
(d) Assertion is not correct, but Reason is correct       

Question 15. Active charcoal is a good catalyst because
(a) made up of carbon atoms 
(b) is very reactive
(c) has more adsorption power
(d) has inert nature toward reagent     

Question 16. Catalyst in a reaction 
(a) lowers the activation energy
(b) increases the rate of reaction
(c) Both (a) and (b)
(d) initiates the reaction     

Question 17. Identify the correct statement regarding enzymes.
(a) Enzymes are specific biological catalysts that can normally function at very high temperatures (T – 1000 K)
(b) Enzymes are normally heterogeneous catalysts that are very specific in their action
(c) Enzymes are specific biological catalysts that cannot be poisoned
(d) Enzymes are specific biological catalysts that possess well defined active sites       

Question 18. Formation of ammonia from H₂ and N₂ by Haber’s process using Fe is an example of 
(a) heterogeneous catalysis
(b) homogeneous catalysis
(c) enzyme catalysis
(d) non-catalytic process       

Question 19. Peptisation involves 
(a) precipitation of colloidal particles
(b) disintegration of colloidal aggregates
(c) evaporation of dispersion medium
(d) Impact of molecules of the dispersion medium on the colloidal particles   

Question 20. Which of the following reactions is an example of heterogeneous catalysis? 

(a) (gas phase)

(b) (g)

(d)

Question 21. Which mixture of the solutions will lead to the formation of negatively charged colloidal [AgI]I– sol ?
(a) 50 mL of 0.1 M AgNO₃ + 50 mL of 0.1 M KI
(b) 50 mL of 1 M AgNO₃ + 50 mL of 1.5 M KI
(c) 50 mL of 1 M AgNO₃ + 50 mL of 2 M KI
(d) 50 mL of 2 M AgNO₃ + 50 mL of 1.5 M KI

Question 22. A colloidal system has particles of which of the following size?
(a) 10^–9 m to 10^–12 m
(b) 10^–6 m to 10^–9 m
(c) 10^–4 m to 10^–10 m
(d) 10^–5 m to 10^–7 m

Question 23. Measuring zeta potential is useful in determining which property of colloidal solution?
(a) Viscosity
(b) Solubility
(c) Stability of the colloidal particles
(d) Size of the colloidal particles 

Question 24. The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As₂S₃ are given below :
I. (NaCl) = 52, II. (BaCl₂) = 0.69,
III. (MgSO₄) = 0.22
The correct order of their coagulating power is
(a) I > II > III
(b) II > I > III
(c) III > II > I
(d) III > I > II

Question 25. Fog is a colloidal solution of
(a) solid in gas
(b) gas in gas
(c) liquid in gas
(d) gas in liquid.

Question 26. On which of the following properties does the coagulating power of an ion depend?
(a) The magnitude of the charge on the ion alone
(b) Size of the ion alone
(c) Both magnitude and sign of the charge on the ion
(d) The sign of charge on the ion alone

Question 27. Which one of the following forms micelles in aqueous solution above certain concentration?
(a) Dodecyl trimethyl ammonium chloride
(b) Glucose
(c) Urea
(d) Pyridinium chloride 

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Question 28. Which property of colloidal solution is independent of charge on the colloidal particles?
(a) Electroosmosis
(b) Tyndall effect
(c) Coagulation
(d) Electrophoresis

Question 29. The protecting power of lyophilic colloidal sol is expressed in terms of
(a) coagulation value
(b) gold number
(c) critical micelle concentration
(d) oxidation number. 

Question 30. Which one of the following method is commonly used method for destruction of colloid?
(a) Dialysis
(b) Condensation
(c) Filteration by animal membrane
(d) By adding electrolyte 

Question 31. At the critical micelle concentration (CMC) the surfactant molecules
(a) associate
(b) dissociate
(c) decompose
(d) become completely soluble.

Question 32. Position of non-polar and polar part in micelle
(a) polar at outer surface but non-polar at inner surface
(b) polar at inner surface non-polar at outer surface
(c) distributed over all the surface
(d) are present in the surface only. 

Question 33. Preparation of Lyophobic sols by chemical method involves
(a) double decomposition
(b) oxidation & reduction
(c) hydrolysis
(d) all of these

Question 34. The ability of anion, to bring about coagulation of a given colloid, depends upon
(a) magnitude of the charge
(b) both magnitude and charge
(c) its charge only
(d) sign of the charge alone.

Question 35. When a few typical solutes are separated by a particular selective membrane such as protein particles, blood corpuscles, this process is called
(a) transpiration
(b) endosmosis
(c) dialysis
(d) diffusion

Question 36. Under the influence of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using NaCl, Na₂SO₄ and Na₃PO₄ solutions. Their coagulating values will be in the order 
(a) NaCl > Na₂SO₄ > Na₃PO₄
(b) Na₂SO₄ > Na₃PO₄ > NaCl
(c) Na3PO₄ > Na₂SO₄ > NaCl
(d) Na₂SO₄ > NaCl > Na₃PO₄

Question 37. A colloidal solution is subjected to an electrical field. The particles move towards anode. The coagulation of same sol is studied using NaCl, BaCl₂ and AlCl₃ solutions. Their coagulating power should be
(a) NaCl > BaCl₂ > AlCl₃
(b) BaCl₂ > AlCl₃ > NaCl
(c) AlCl₃ > BaCl₂ > NaCl
(d) BaCl₂ > NaCl > AlCl₃

Question 38. Which one of the following impurities present in colloidal solution cannot be removed by electrodialysis? 
(a) Sodium chloride
(b) Potassium sulphate
(c) Urea
(d) Calcium chlorid

Question 39. Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is 
(a) D < A < C < B
(b) C < B < D < A
(c) A < C < B < D
(d) B < D < A < C

Question 40. The disease kala azar is caused by 
(a) colloidal antimony
(b) milk of magnesia
(c) argyrols
(d) colloidal gold

Question 41. Which one of the following reactions is an example of auto-catalysis?
(a) 2AsH₃(s) → 2As(s) + 3H₂(g)
(b) N₂(g) + 3H₂(g) →^Fe(g) 2NH₃(g)
(c) 2SO₂(g) + O₂(g) →^No(g) 2SO₃(g)
(d) C₁₂H₂₂O₁₁(/) + H₂O(/) →^H+(/) C₆H₁₂O₆ (/) + C₆H₁₂O₆(/)     

Question 42. Amount of gas adsorbed per gram of adsorbent increases with pressure, but after certain limit is reached, adsorption becomes constant. It is due to
(a) multilayers are formed
(b) desorption takes place
(c) temperature is increased
(d) absorption also starts   

Question 43. Which of the following statements is incorrect regarding physisorption?
(a) It occurs because of van der Waals’ forces
(b) More easily liquefiable gases are adsorbed readily
(c) Under high pressure, it results into multimolecular layer on adsorbent surface
(d) Enthalpy of adsorption (ΔH_adsorption) is slow and positive   

Question 44. The volume of the gases H₂, CH₄, CO₂ and NH₃ adsorbed by one of activated charcoal at 298 K are in order
(a) H₂ > CO₂ > CH₄ > NH₃
(b) H₂ > CH₄ > CO₂ > NH₃
(c) NH₃ > CO₂ > CH₄ > H₂
(d) NH₃ > CH₄ > CO₂ > H₂         

Question 45. Given below, catalyst and corresponding process/ reaction are matched. The mismatch is
(a) [RhCl(PPh₃)₂] : Hydrogenation
(b) TiCl₄ + Al(C₂H₅)₃ : Polymerisation
(c) V₂O₅ : Haber : Bosch process
(d) Nickel : Hydrogenation     

Question 46. The decomposition of H₂O₂ may be checked by adding small quantity of phosphoric acid. This is an example of
(a) neutralisation
(b) negative catalysis
(c) positive catalysis
(d) catalytic poisoning       

Question 47. For a linear plot of log(x /m ) versus log p in a Freundlich adsorption isotherm, which of the following statements is correct? (k and n are constants) 
(a) 1/n appears as the intercept 
(b) Only 1/n appears as the slope
(c) log (1/n) appears as the intercept
(d) Both k and 1/n appear in the slope term   

Question 48. In the Freundlich adsorption equation x/m = kp^1/n ,  the value of n is
(a) always greater than one
(b) always smaller than one
(c) always equal to one
(d) greater than one at low temperature and smaller than one at high temperature   

Question 49. The Langmuir adsorption isotherm is deduced using which of the following assumptions?
(a) The adsorption takes place in multilayer
(b) The adsorbed molecules interact with each other
(c) The adsorption sites are equivalent in their ability to absorb the particles
(d) The heat of adsorption varies with coverage     

Question 50. In Langmuir’s model of adsorption of a gas on a solid surface,
(a) the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered
(b) the adsorption at a single site on the surface may involve multiple molecules at the same time
(c) the mass of gas striking a given area of surface is proportional to the pressure of the gas
(d) the mass of gas striking a given area of surface is independent of the pressure of the gas 

Question 51.  Adsorption is a surface phenomenon because
(a) adsorbent has large surface area
(b) chemical compounds formed are not on the surface of adsorbent
(c) only the surfaces of the adsorbent have unutilised valencies
(d) None of the above 

Question 52. Surface area per gram of the adsorbent is called
(a) molar surface area
(b) normal surface area
(c) specific surface area
(d) equivalent surface area     

Question 53. Which one of the following characteristics is not correct for physical adsorption?
(a) Adsorption on solids is reversible
(b) Adsorption increases with increase in temperature
(c) Adsorption is spontaneous
(d) Both enthalpy and entropy of adsorption are negative 

Question 54. Which of the following assumptions is not correct about Langmuir adsorption isotherm?
(a) The solid surface is homogeneous and has a fixed number of adsorption sites
(b) Every adsorption site is equivalent
(c) The adsorbed layer is not uniform all over the adsorbent
(d) The adsorbed gas behaves ideally in the vapour phase   

Question 55. In which of the following reactions, heterogeneous catalysis is involved?
(i) 2SO₂ (g) +O₂(g) →^NO(g) 2SO3NO(g)
(ii) 2SO₂(g) →^Pt(s) 2SO₃ 
(iii) N₂(g) + 3H₂(g) →^Fe(s) 2SO₃(g)
(iv) CH₃COOCH₃ (/) + H₂O→HCl ^(/)     
                                CH₃COOH(aq)+ CH₃OH(aq)            
(a) (ii) and (iii)
(b) (ii), (iii) and (iv)
(c) (i), (ii) and (iii)
(d) Only (iv)       

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