MCQs for NCERT Class 12 Chemistry Chapter 5 Surface Chemistry

Please refer to the MCQ Questions for Class 12 Chemistry Chapter 5 Surface Chemistry with Answers. The following Surface Chemistry Class 12 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 12. Our experts have designed MCQ Questions for Class 12 Chemistry with Answers for all chapters in your NCERT Class 12 Chemistry book.

Surface Chemistry Class 12 MCQ Questions with Answers

See below Surface Chemistry Class 12 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question. The physical adsorption of gases on the solid surface is due to:
(a) Covalent bond
(b) Hydrogen bond
(c) Ionic bond
(d) Van der waal’s forces

Question. The electrical charge on a colloidal particle is observed by: 
(a) Ultramicroscope
(b) Scattering
(c) Brownian movement
(d) Electrophoresis

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. Lyophilic colloids are stable due to:
(a) Small size of the particle
(b) Large size of the particle
(c) Layer of dispersion medium on the particle
(d) Charge on the particle

Question. Purple of cassius is colloidal solution of :
(a) Silver
(b) Lead 
(c) Gold
(d) Mercury

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 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. Milk is colloid in which : 
(a) Liquid is dispersed in liquid
(b) Gas is dispersed in liquid
(c) Sugar is dispersed in water
(d) Solid is dispersed in liquid

Question. The colloid is : 
(a) urea
(b) blood
(c) cane sugar
(d) NaCl

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

Question. Which of the following reaction is an exan1ple for homogeneous catalysis ? 
(a) 2H₂O₂(/) →^MnO₂(s) 2H₂O(/) + O₂(g)
(b) 2SO₂ (g) + O₂ (g) →^V₂O₅₍s) 2SO₃ (g)
(c) 2CO(g) + O₂ (g) →^NO(g) 2CO₂ (g)
(d) H₂(g)+ C₂H₄(g) →^C₂H₆ (g)         

Question. Potassium stearate is obtained by the saponification of an oil or fat. It has formula CH₃ — (CH₂ )₁₆— COOK. The molecule has a lyophobic terminal CH₃ and a lyophilic tem1inal-COOK. Potassium stearate is an example of
(a) lyophilic colloid 
(b) lyophobic colloid
(c) macromolecular colloid
(d) micelle or associated colloid   

Question. Which of the following is an example for heterogeneous catalysis reaction ?
(a) 2SO₂(g) + O₂ (g) →^NO(g) 2SO₃(g)
(b) Hydrolysis of aqueous sucrose solution in the presence of aqueous mineral acid
(c) 2H₂O₂(l) →^pt(s) 2H₂O(/) + O₂(g)
(d) Hydrolysis of liquid in the presence of aqueous mineral acid       

Question. Gold sol is not 
(a) a macromolecular colloid
(b) a lyophobic colloid
(c) a multimolecular colloid
(d) negatively charged colloid     

Question. Cow milk, an example of natural emulsion is stabilised by
(a) fat
(b) water
(c) casein
(d) Mg²⁺ ions       

Question. The coagulating power of electrolytes having ions Na+ , Al³⁺ and Ba²⁺ for arsenic sulphide sol increases in the order
(a) Al³⁺ < Ba²⁺ < Na⁺
(b) Na⁺ < Ba²⁺ < Al³⁺
(c) Ba²⁺ < Na²⁺ < Al³⁺
(d) Al³⁺ < Na⁺ < Ba²⁺     

Question. Lyophilic sols are more stable than lyophobic sols because
(a) the colloidal particles have negative charge 
(b) the colloidal particles have positive charge
(c) the colloidal particles are solvent
(d) None of the above     

Question. In the case of small cuts, bleeding is stopped by applying potash alum. Here alum acts as 
(a) fungicide
(b) disinfectant
(c) germicide
(d) coagulating agent     

Question. In a reversible reaction, the catalyst
(a) increases the activation energy of the backward reaction
(b) increases the activation energy of the forward reaction
(c) decreases the activation energy of both forward and backward reaction
(d) decreases the activation energy of forward reaction     

Question. When a beam oflight is passed through a collodial solution it 
(a) is reflected
(b) is scattered
(c) transmitted
(d) absorbed
(e) refracted     

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. The movement of colloidal particles, under applied electric current is known as : 
(a) electrodialysis
(b) dialysis
(c) electrophoresis
(d) none of the above

Question. The size of colloidal particle is 
(a) 10^–3 to 10^–9 m
(b) 10^–3 to 10^–12 m
(c) 10^–6 to 10^–9 m
(d) 10^–12 to 10^–19 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. A catalyst 
(a) changes the equilibrium constant
(b) lowers the activation energy
(c) increases the forward and backward reactions at different speeds.
(d) follows same mechanism for the reaction.

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. Which of the following is a lyophobic colloidal solution ? 
(a) Aqueous starch solution
(b) Aqueous protein solution
(c) Gold solution
(d) Polymer solvent in some organic solvents

Question. The density of gold is 19 g/cm3. If 1.9 × 10^–4 g of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius 10 nm, then the number of gold particles per mm³ of the sol will be 
(a) 1.9 × 10 ¹²
(b) 6.3 × 10 ¹⁴
(c) 6.3 × 10¹⁰
(d) 2.4 × 10⁶

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 of the following electrolyte will have maximum flocculation value for Fe(OH)₃ sol?
(a) NaCl
(b) Na₂S 
(c) (NH₄)₃PO₄
(d) K₂SO₄

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. Which of the following ions will have the minimum coagulating value for the sol obtained by adding FeCl₃ solution to slight excess of NaOH 
(a) SO^2-₄
(b) [Fe(CN)₆ ]^3-
(c) Ba²⁺
(d) Al³⁺

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. 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. 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. Which of the following small sized elements can replace the silicon and aluminium in the frame work at zeolites?
(a) Boron
(b) Magnesium
(c) Phosphorus
(d) All of these   

Question. KClO₃ on heating decomposes into KCl and O₂. If some MnO₂ is added, the reaction goes much faster because
(a) MnO₂ decomposes to give oxygen
(b) MnO₂ acts as catalyst
(c) MnO₂ provides heat by reacting
(d) MnO₂ provides better contact       

Question. Which of the following statements is incorrect?
(a) Catalysts only accelerate the rate of chemical equation
(b) Catalysts cannot start a chemical reaction
(c) Catalysts can retard the rate of a chemical reaction 
(d) Catalysts can expedite and retard the rate of a chemical reaction       

Question. 50 mL of 1 M oxalic acid (molar mass =126) is shaken with 0.5 g of wood charcoal. The final concentration of the solution after adsorption is 0.5 M. What is the amount of oxalic acid adsorbed per gram of carbon?
(a) 3.15
(b) 1.575
(c) 6.30
(d) 12.60       

Question. The catalyst which is a zeolite can convert alcohol to various types of gasoline (petrol) by shape selective catalysis is
(a) erionite
(b) ZSM-5
(c) gemelinite
(d) fanzasite     

Question. It is instructed that automobiles with catalytic converter must use unleaded gasolines because
(a) leaded gasolines may give more fumes
(b) surface of the catalyst is rendered ineffective by adsorption of lead
(c) automobiles with catalytic converter cannot run on leaded gasolines
(d) unleaded gasoline is cheaper         

Question. The efficiency of an enzyme in catalysing a reaction is due to its capacity
(a) to form an enzyme substrate complex
(b) to decrease the bond energies of the substrate molecule
(c) to change the shape of the substrate molecule
(d) None of the above   

Question. The void space in zeolites forms more than 50% of the total volume which is occupied by
(a) silicates
(b) aluminates
(c) water molecules
(d) Na⁺ , Mg²⁺ and Ca²⁺ ions     

Question. During the adsorption of krypton on activated charcoal at low temperature,
(a) ΔH > 0 and ΔS > 0
(b) ΔH < 0 and ΔS < 0
(c) ΔH > 0 and ΔS > 0
(d) ΔH < 0 and ΔS > 0       

Question. Which of the following statements is false?
(a) Adsorption may be monolayer or multilayer
(b) Increase of pressure increases the amount of adsorption
(c) Increase of temperature may decrease the amount of adsorption
(d) Particle size of adsorbent will not affect the amount of adsorption       

Question. Which one of the following is an example of homogeneous catalysis?
(a) Acid hydrolysis of methyl acetate
(b) Catalytic conversion of water gas to methanol
(c) Catalytic conversion of SO₂ to SO₃ in contact process
(d) Haber’s process of synthesis of ammonia         

Question. In the Freundlich adsorption isotherm equation,
log x/m = log k + 1/n log p, the value of n is
(a) any value from 0 to 1
(b) a negative integer
(c) a positive integer
(d) a positive or negative integer         

Question. 1g of charcoal adsorbs 100 mL of 0.5M CH₃COOH to form a monolayer, and thereby the molarity of CH3COOH reduces to 0.49 M. What is the surface area of charcoal used by each molecule of acetic acid?
[Surface area of charcoal = 3.01 × 10² m² /g]
(a) 6.02 × 10⁻²⁰ m²
(b) 5.00 × 10⁻¹⁹ m²
(c) 3.01 × 10⁻² m²
(d) 2.00 × 10⁻¹⁹ m²       

Question. Select the incorrect statement.
(a) The rate of enzyme catalysed reaction also depends upon enzyme concentration
(b) The rate of enzyme catalysed reaction depends upon ionic strength
(c) The rate of enzyme catalysed reaction first increases with temperature and then decreases after attaining optimum temperature  
(d) The increase in activity of protein as enzyme is due to denaturation     

Question. According to Freundlich adsorption isotherm, which of the following is correct? 
(a) x/m ∝ p⁰
(b) x/m ∝ p¹
(c) x/m ∝ p^1/n
(d) All of these