Surface Chemistry Practice Test — Class 12 Chemistry

12th Standard Chemistry — Surface Chemistry: Online Practice Test

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Which of the following is incorrect for physisorption?

A.reversible B.increases with increase in temperature C.low heat of adsorption D.increases with increase in surface area

Which one of the following characteristics are associated with adsorption?

A.\(\Delta G\) and \(\Delta H\) are negative but \(\Delta S\) is positive B.\(\Delta G\) and \(\Delta S\) are negative but \(\Delta H\) is positive C.\(\Delta G\) is negative but \(\Delta H\) and \(\Delta S\) are positive D.\(\Delta G\), \(\Delta H\) and \(\Delta S\) all are negative.

Fog is colloidal solution of

A.solid in gas B.gas in gas C.liquid in gas D.gas in liquid

Assertion : Coagulation power of \(Al^{3+}\) is more than \(Na^+\). Reason : greater the valency of the flocculating ion added, greater is its power to cause precipitation

A.if both assertion and reason are true and reason is the correct explanation of assertion. B.if both assertion and reason are true but reason is not the correct explanation of assertion. C.assertion is true but reason is false D.both assertion and reason are false.

Statement : To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?

A.It is not true, ferric chloride is a poison. B.It is true, \(Fe^{3+}\) ions coagulate blood which is a negatively charged sol C.It is not true; ferric chloride is ionic and gets into the blood stream. D.It is true, coagulation takes place because of formation of negatively charged sol with \(Cl^-\).

Hair cream is

A.gel B.emulsion C.solid sol D.sol

Which one of the following is correctly matched?

A.Emulsion – Smoke B.Gel – butter C.foam – Mist D.whipped cream – sol

The most effective electrolyte for the coagulation of \(As_2S_3\) Sol is

A.\(NaCl\) B.\(Ba(NO_3)_2\) C.\(K_3[Fe(CN)_6]\) D.\(Al_2(SO_4)_3\)

Which one of the is not a surfactant?

A.\(CH_3 (CH_2)_{15} N (CH_3)_2 CH_2Br\) B.\(CH_3 (CH_2)_{15} NH_2\) C.\(CH_3 (CH_2)_{14} CH_2 COONa\) D.\(CH_3 (CH_2)_{15} SO_2 Na\)

Q10

The phenomenon observed when a beam of light is passed through a colloidal solution is

A.Cataphoresis B.Electrophoresis C.Coagulation D.Tyndall effect

Q11

In an electrical field, the particles of a colloidal system move towards cathode. The coagulation of the same sol is studied using \(K_{2}SO_{4}\) (i), \(Na_{3}PO_{4}\) (ii), \(K_{4}[Fe(CN)_{6}]\) (iii) and \(NaCl\) (iv). Their coagulating power should be

A.II > I > IV > III B.III > II > I > IV C.I > II > III > IV D.none of these

Q12

Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture?

A.Nitroglycerine B.Cellulose acetate C.Glycoldinitrate D.Nitrocellulose

Q13

Which one of the following is an example for homogeneous catalysis?

A.manufacture of ammonia by Haber’s process B.manufacture of sulphuric acid by contact process C.hydrogenation of oil D.Hydrolysis of sucrose in presence of dil HCl

Q14

Match the following A) \(V_{2}O_{5}\) i) High density polyethylene B) Ziegler – Natta ii) PAN C) Peroxide iii) \(NH_{3}\) D) Finely divided Fe iv) \(H_{2}SO_{4}\)

A.(iv) (i) (ii) (iii) B.(i) (ii) (iv) (iii) C.(ii) (iii) (iv) (i) D.(iii) (iv) (ii) (i)

Q15

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of \(As_{2}S_{3}\) are given below: (I) (NaCl) = 52 (II) (\(BaCl_{2}\)) = 0.692 (III) (\(MgSO_{4}\)) = 0.224 The correct order of their coagulating power is

A.III > II > I B.I > II > III C.I > III > II D.II > III > I

Q16

Adsorption of a gas on solid metal surface is spontaneous and exothermic, then

A.\(\Delta H\) increases B.\(\Delta S\) increases C.\(\Delta G\) increases D.\(\Delta S\) decreases

Q17

If x is the amount of adsorbate and m is the 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 = PT

Q18

On which of the following properties does the coagulating power of an ion depend?

A.Both magnitude and sign of the charge on the ion. B.Size of the ion alone C.the magnitude of the charge on the ion alone D.the sign of charge on the ion alone.

Q19

Match the following A) Pure nitrogen i) Chlorine B) Haber process ii) Sulphuric acid C) Contact process iii) Ammonia D) Deacons Process iv) sodium azide (or) Barium azide

A.(i) (ii) (iii) (iv) B.(ii) (iv) (i) (iii) C.(iii) (iv) (ii) (i) D.(iv) (iii) (ii) (i)

Q20

Which of the following conditions defines positive adsorption at an interface?

A.Concentration of the substance at the interface is higher than in the bulk B.Concentration of the substance at the interface is lower than in the bulk C.The substance is distributed uniformly throughout the entire system D.The substance is completely removed from the surface phase

Q21

Which type of force is primarily responsible for physical adsorption (physisorption)?

A.Strong covalent chemical bonds B.Weak Van der Waals forces C.Electrostatic forces between ions D.Metallic bonding interactions

Q22

Based on the nature of the adsorbate, which of the following gases will be adsorbed most readily on the surface of charcoal?

A.Hydrogen (\(H_2\)) B.Nitrogen (\(N_2\)) C.Oxygen (\(O_2\)) D.Sulphur dioxide (\(SO_2\))

Q23

In the Freundlich adsorption isotherm, what does the slope represent in a plot of \(\log(x/m)\) against \(\log p\)?

A.\(\log K\) B.\(K\) C.\(1/n\) D.\(n\)

Q24

In the industrial synthesis of ammonia by Haber's process, what is the role of Molybdenum (Mo)?

A.Catalyst B.Promoter C.Catalytic poison D.Adsorbate

Q25

Which theory of catalysis explains that the reaction rate increases due to the formation of active centres on a rough surface?

A.Intermediate compound formation theory B.Adsorption theory C.Collision theory D.Electronic theory

Q26

In the mechanism of enzyme action, which part is represented by the 'Lock' according to the lock and key model?

A.Substrate B.Co-enzyme C.Enzyme D.Product

Q27

How did Thomas Graham distinguish colloids from crystalloids during his research on diffusion?

A.Based on their solubility in organic solvents B.Based on their ability to diffuse through a membrane C.Based on their boiling point elevations D.Based on their magnetic properties

Q28

Which of the following common substances is an example of a 'Sol' (solid dispersed in liquid)?

A.Smoke B.Ink C.Cloud D.Cheese

Q29

Which preparation method involves striking an electric arc between metal electrodes to create a colloidal solution of metals like gold?

A.Peptization B.Bredig's arc method C.Ultrasonic dispersion D.Dialysis

Q30

What is the process of removing ionic impurities from a colloidal solution using a semi-permeable membrane called?

A.Condensation B.Dialysis C.Coagulation D.Peptization

Q31

Which optical property of colloidal solutions explains why the sky appears blue?

A.Tyndall effect B.Brownian movement C.Electrophoresis D.Sedimentation

Q32

According to the Hardy-Schulze rule, which of the following ions has the highest coagulating power for a negatively charged \(As_2S_3\) sol?

A.\(Na^+\) B.\(Ba^{2+}\) C.\(Al^{3+}\) D.\(Cl^-\)

Q33

What is meant by the 'inversion of phase' in the study of emulsions?

A.The complete separation of oil and water layers B.The change of a water-in-oil (W/O) emulsion into an oil-in-water (O/W) emulsion C.The conversion of an emulsion into a solid gel D.The process where the dispersed phase evaporates

Q34

In the leather industry, what is the specific role of adding tannin to animal hides?

A.To dissolve the hair present on the skin B.To coagulate the positively charged protein particles in the skin C.To act as a coloring agent for the final leather product D.To increase the water content of the hides

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About this Surface Chemistry test

This free online practice test covers Surface Chemistry from the 12th Standard Chemistry (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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