MCQ Question for Class 12 Chemistry Chapter 5 Surface Chemistry

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Surface Chemistry Class 12 Chemistry MCQ Questions with Answers

Refer below for Surface Chemistry Class 12 MCQ Questions with solutions. Solve questions and compare with the answers provided below

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

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

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

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

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

Question. 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. 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 

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

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

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

Question. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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.  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. 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. 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)       

Question. 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. 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. 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. 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

Question. Random motion of colloidal particles is known as
(a) Dialysis
(b) Brownian movement
(c) Electroosmosis
(d) Tyndall effect

Question. Emulsions can be broken into constituent liquid by ______.
(a) heating
(b) freezing
(c) centrifuging
(d) All of these

Question. In which of the following Tyndall effect is not observed ?
(a) Suspensions
(b) Emulsions
(c) Sugar solution
(d) Gold sol

Question. Which of the following is not the condition for Tyndall effect?
(a) The refractive indices of dispersed phase and dispersion medium should differ greatly in magnitude.
(b) The diameter of the dispersed particles is not much smaller than the wavelength of light used.
(c) Tyndall effect is observed only when viewed from the direction of the passage of light.
(d) All of these are required conditions for Tyndall effect.

Question. Which of the following is not true about the emulsion?
(a) Emulsion can be broken into constituent liquids by heat, freezing
(b) Emulsion of oil in water is generally unstable
(c) Emulsion do not show the Tyndall effect
(d) They show brownian motion

Question. Which of the following is not emulsifying agent for W/O emulsion?
(a) Lampblack
(b) Long chain alcohol
(c) Proteins
(d) Heavy metal salts of fatty acids

Question. Which of the following colloid does not contain liquid as a dispersion medium?
(a) Sol
(b) Gel
(c) Emulsion
(d) Foam

Question. 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 chloride

Question. Brownian movement is found in
(a) Colloidal solution
(b) Suspension
(c) Saturated solution
(d) Unsaturated solution

Question. Which of the following phenomenon occurs when the precipitate of Mg(OH)₂ attains blue colour in presence of magneson reagent?
(i) Absorption of solvent
(ii) Adsorption of coloured substance
(iii) Absorption and adsorption both of solvent
(iv) Adsorption of solvent
(a) (i) and (ii)
(b) (ii) only
(c) (ii) and (iv)
(d) (iii) only

Question. Which of the following method is used for coagulation of the sol?
(a) By mixing two oppositely charged sols.
(b) By electrophoresis.
(c) By addition of electrolytes.
(d) All of the above.

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