Chapter 5 Surface Chemistry MCQs for Class 12 Chemistry

Chapter 5 Surface Chemistry MCQs for Class 12 Chemistry

Here students can practice Chapter 5 Surface Chemistry MCQs for Class 12 Chemistry. All the MCQs are divided into several sub-pages. Each page has 40 MCQs, for the next page just scroll down and click on the button. Also you can practice Class 12 Chemistry MCQs (Multiple Choice Questions) for other units.

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Q 1.: The presence of electric charge on the colloidal particle is indicated by the experiment 

(A) Dialysis

(B) Osmosis

(C) Electrophoresis

(D) Electrolysis

Option – C

Q 2.: Which of the following is an example of absorption

(A) Water on silica gel

(B) Water on calcium chloride

(C) Hydrogen on finely divided nickel

(D) Oxygen on metal surface

Option – B

Q 3.:Which of the following electrolyte will have maximum flocculation value for Fe(OH)3 sol ?

(A) NaCl 

(B) Na2S

(C) (NH4)3PO4 

(D) K2SO4 

Option – A

Q 4.:Which one of the following is not explained by adsorption ?

(A) When acetic acid solution is shaken with charcoal, the concentration of the acid decreases.

(B) The white precipitate of Mg(OH)2 attains blue colour when precipitated in the presence of magneson reagent

(C) An aqueous solution of NaOH attains pink colour with a drop of phenolphthalein

(D) The air becomes dry in the presence of silica gel.

Option – C

Q 5.:Which of the following statement is incorrect for physical adsorption ?

(A) It is instantaneous.

(B) Monomolecular layer forms on the adsorbent

(C) Less activation energy is required for it

(D) Generally it results at low temperature and adsorption decreases with increase in temperature

Option – B

Q 6.: In Freundlich adsorption isotherm the value of yn is

(A) Between 0 and 1 in all cases

(B) Between 2 and 4 in all cases

(C) 1 in case of physical adsorption

(D) 1 in case of chemisorption

Option – A

Q 7.: Adsorption is accompanied by the evolution of heat, so according to Le-chatelier’s principle, the amount of substance absorption should

(A) increase with increase in temperature

(B) decrease with decrease in temperature

(C) increase with decrease in temperature

(D) None of these

Option – C

Q 8.: Which of the following is a wrong statement for physisorption ?

(A) It is a reversible reaction

(B) The value of absorption enthalpy is low

(C) It is generally occurring at low temperature

(D) Reaction requires an activation energy

Option – D

Q 9.: Pieces of wood burn faster than a log of wood of the same mass because

(A) Surface area of log of wood is larger and needs more time to burn

(B) Pieces of wood have large surface area

(C) All pieces of wood catch fire at the same time

(D) Block of wood has higher density than pieces of the same wood

Option – B

Q 10.: Which among the following statement is false.:  

(A) The adsorption may be mono-layered or multi-layered

(B) Increase of pressure increases amount of adsorption

(C) Particle size of adsorbent will not affect the amount of adsorption

(D) All of the above

Option – C

Q 11.:  The gas that is adsorbed to a large extent on charcoal is

(A) H2

(B) CO

(C) CO2

(D) NH3

Option – D

Q 12.: The Langmuir adsorption isotherm is deduced using the assumption

(A) The adsorption takes place in multilayers

(B) The adsorption sites are equivalent in their ability to adsorb the particles

(C) The heat of adsorption varies with coverage

(D) The adsorbed molecules interact with each other

Option – A

Q 13.: Select the incorrect statement.

(A) Physical adsorption is reversible while chemical is irreversible

(B) High pressure favours physical adsorption while low pressure favours chemical adsorption

(C) Physical adsorption is not specific while chemical is highly specific

(D) High activation energy is involved in chemical adsorption

Option – B

Q 14.: According to the adsorption theory of catalysis the speed of reaction increases because

(A) Adsorption produces heat which increases the speed of reaction

(B) Adsorption lowers the activation energy of the reaction

(C) The concentration of reactant molecules at the active centres of the catalyst becomes high due to absorption

(D) In the process of adsorption, the activation energy of the molecules large

Option – A

Q 15.: Which one of the following is an example for homogeneous catalysis

(A) Manufacturing of sulphuric acid by contact process

(B) Manufacturing of ammonia by Haber process

(C) Hydrolysis of sugar in the presence of dilute hydrochloric acid

(D) Hydrogenation of oil

Option – C

Q 16.: What is the role of a catalyst in a reaction ?

(A) Affects the enthalpy change

(B) Affects the free energy change

(C) Increase the activation energy

(D) Lowers the activation energy

Option – D

Q 17.: Catalytic poisons act by

(A) Making the products chemically inactive

(B) Increasing the rate of the backward reactions

(C) Chemical combination with any one of the reactants

(D) Preferential adsorption on the catalyst surface

Option – D

Q 18.: Shape-selective-catalysis is a reaction catalysed by

(A) Platinum

(B) Zeolites

(C) Ziegler-natta catalyst

(D) Enzymes

Option – B

Q 19.: Adsorption of gases on solid surface is exothermic since

(A) Entropy is decreases

(B) Entropy is increases

(C) Free energy increases

(D) Enthalpy is positive

Option – A

Q 20.: Stability of lyophilic colloids is due to

(A) same charge on all the colloidal particles

(B) solvation of the colloidal particles

(C) both ‘A’ and ‘B’

(D) the fact that they are organic substances

Option – C

Q 21.: Which of the following statements is correct for the spontaneous adsorption of a gas ?

(A) ΔS is negative and, therefore ΔH should be highly positive

(B) ΔS is negative and, therefore ΔH should be highly negative

(C) ΔS is positive and, therefore ΔH should be highly positive

(D) ΔS is positive and, therefore ΔH should be highly negative

Option – B

Q 22.: Which of the following process is responsible for the formation of delta at a place where rivers meet the sea ?

(A) Peptization

(B) Coagulation

(C) Colloid formation

(D) Emulsification

Option – B

Q 23.: Which property of colloids is not depend on the charge on colloidal particles ?

(A) Coagulation

(B) Electrophoresis

(C) Electro-osmosis

(D) Tyndall effect

Option – D

Q 24.: At high concentration of soap in water, soap behaves as ……….

(A) Associated colloid

(B) Multimolecular colloid

(C) Macromolecular colloid

(D) Lyophobic colloid

Option – A

Q 25.: Which one of the following has minimum gold number ? 

(A) Starch 

(B) Gum arabic 

(C) Sodium oleate

(D) Gelatin

Option – D

Q 26.: Which one of the following does not involve coagulation ?

(A) Formation of delta region

(B)  Petptization 

(C)  Treatment of drinking water by potash alum

(D) Clotting of blood by the use of ferric chloride

Option – B

Q 27.: Which of the following process is not responsible for the presence of electric charge on the sol particles ?

(A) Electron capture by sol particles

(B) Adsorption of ionic species from solution

(C) Absorption of ionic species from solution

(D) Formation of helmholtz electrical double layer

Option – C

Q 28.: Decomposition of hydrogen peroxide can be prevented in presence of 

(A) Glycerol 

(B) Acetanilide 

(C) Phosphoric acid 

(D) All of these

Option – D

Q 29.: Intensity of the scattered light depends upon the difference of which of the following property of the dispersed phase and the dispersion medium ?

(A) Density 

(B) Refractive index

(C) Viscosity 

(D) Surface tension

Option – B

Q 30.: Tanning of leather is

(A) Colouring of leather by chemicals

(B) Drying process to make the leather hard

(C) Polishing of leather

(D) Hardening of leather by coagulation

Option – D

Q 31.: Gelatine is mostly used in making ice-creams in order to

(A) Prevent crystallisation and stabilise the mix

(B) Prevent forming the colloidal sol

(C) Modify the taste

(D) Enrich the fragrance

Option – A

Q 32.: Which of the following process does not occur at the interface of phases ? 

(A) Crystallisation 

(B) Homogenous catalysis

(C) Heterogenous catalysis

(D) Corrosion 

Option – B

Q 33.: Which of the following does not form a lyophilic colloid ? 

(A) Rubber dissolved in benzene

(B) White of the egg dissolved into water 

(C) Common salt added to benzene

(D) Stannous chloride solution added to gold chloride solution 

Option – D

Q 34.: Which of the following is correct ?

(A) Adsorption is always exothermic

(B) Adsorption is always endothermic

(C) Physical adsorption is endothermic whereas chemisorption is exothermic

(D) Physical adsorption is exothermic whereas chemisorption is endothermic 

Option – A

Q 35.: What happens when blood charcoal is stirred in a solution of KCl ?

(A) Dilute KCl solution shows no adsorption whereas concentrated KCl shows adsorption 

(B) Concentrated KCl solution shows no adsorption whereas dilute KCl shows adsorption 

(C) Dilute KCl solution shows positive adsorption whereas concentrated KCl solution shows negative adsorption

(D) Concentrated KCl solution shows positive adsorption whereas dilute KCl solution shows negative adsorption 

Option – D

Q 36.: An example of autocatalysis is

(A) Oxidation of NO to NO2

(B) Oxidation of SO2 and SO3

(C) Decomposition of KClO3 to KCl and O2

(D) Oxidation of oxalic acid by acidified KMnO4 

Option – D

Q 37.: Method by which lyophobic sol can be protected 

(A) By addition of an electrolyte

(B) By addition of oppositely charged sol

(C) By addition of lyophilic sol

(D) By prolonged dialysis 

Option – C

Q 38.: Which of the following will show Tyndall effect ?

(A) Aqueous solution of soap above critical micelle concentration

(B) Aqueous solution of soap below critical micelle concentration

(C) Aqueous solution of sodium chloride

(D) Aqueous solution of sugar

Option – A

Q 39.: On addition of one mL solution of 10% NaCl to 10 mL gold sol in the presence of 0.0250 gm of starch, the coagulation is just prevented. Starch has the following gold number :

(A) 0.025 

(B) 0.25

(C) 2.5

(D) 25.0

Option – D

Q 40.: The coagulation of 200 mL of a positive colloid took place when 0.73 gm HCl was added to it without changing the volume much. The coagulating value of HCl for the colloid is

(A) 150

(B) 100

(C) 73

(D) 60

 

Option – B

Pagination

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We hope that these Chapter 5 Surface Chemistry MCQs for Class 12 Chemistry helped you in learning new concepts. All questions are based on NCERT syllabus and some of them have been asked in various competitive exams. You can go to the next pages to practice more for Chapter 5 Surface Chemistry MCQs for Class 12 Chemistry, click on the question range given above.

Also you can practice Class 12 Chemistry MCQs (Multiple Choice Questions) for other units.