Surface Chemistry Multiple Choice Questions pdf
Surface Chemistry Multiple Choice Questions pdf
Que 1. What is the emulsifier in milk?
(a) albumin (b) soap
(c) gelatin (d) casein
Ans: (d)
Reason: An emulsifier is an additive that helps two liquids mix.
Que 2. Which one of the following gases will be adsorbed most easily?
(a) N2 (b) H2 (c) O2 (d) CO2
Ans: (d)
Reason: Higher is the critical temperature easier is to liquefy the gas. CO2 has a higher critical temperature (304.25 K) so easier to liquify.
Que 3. Cottrell precipitator works on the principle of:
(a) distribution law (b) addition of electrolyte
(c) Le-chattelier principle (d) Neutralization of charge on colloids
Ans: (d)
Reason: Smoke coming out of the chimney in the industrial areas is a health hazard. It is a colloidal particles that are charged particles and thus they are removed from gases by electrical precipitation (Cottrell Precipitator) which involves neutralisation of charged colloidal particles present in the smoke.
Surface Chemistry Multiple Choice Questions pdf
Que 4. The formation of micelles takes place only above:
(a) inversion temperature (b) Boyle temperature
(c) critical temperature (d) Kraft temperature
Ans: (d)
Reason: Kraft Temperature is the minimum temperature above which the formation of micelles takes place.
Que 5. A colloidal solutions show:
(a) very high osmotic pressure (b) high osmotic pressure
(c) low osmotic pressure (d) no osmotic pressure
Ans: (c)
Reason: All colloidal solutions behave normally as electrolytes and the movement of solvent from solvent to colloidal solution is very less as the concentration gradient for solvent movement is not significant. hence, colloidal solutions show low osmotic pressure.
Que 6. Alums purify muddy water by:
(a) dialysis (b) adsorption (c) absorption (d) coagulation
Ans: (d)
Reason: The stability of the lyophobic sols is due to the presence of charge on colloidal particles. If the charge is removed, particles come together and settle down. Spontaneous destabilization of the solution is ageing and destabilization of the solution by artificial means is called coagulation. Alums purify muddy water by coagulation.
Surface Chemistry Multiple Choice Questions pdf
Que 7. Which is an example of auto-catalysis?
(A) Decomposition of KCIO3 + MnO2 mixture
(B) The decomposition of nitroglycerine
(C) Breakdown of 6C14
(D) Hydrogenation of vegetable oils using a catalyst
Ans: (B) The decomposition of nitroglycerine
Reason: Decomposition of nitroglycerine is autocatalysis. So it’s used in explosive, TNT.
Que 8. Milk is an example of
(A) Emulsion (B) Suspension (C) Foam (D) Sol
Ans: (A)
Reason: Milk–Emulsion. (Oil in water)
Que 9. Given below are a few electrolytes, indicate which one among them will bring about the coagulation of a gold sol quickest and in the least of molar concentration?
(A) NaCl (B) MgSO4 (C) Al2(SO4)3 (D) K4[Fe(CN)6]
Ans: (C) Al2(SO4)3
Reason: Gold sol in negative. So Al3+ will be the best coagulating agent.
Que 10. When a lyophobic colloidal solution is observed, we can see
(A) Light scattered by colloidal particle (B) Size of the colloidal particle
(C) Shape of the colloidal particle (D) Relative size of the colloidal particle
Ans: (A)
Reason: We can observe the scattering of light due to the larger size of particles.
Surface Chemistry Multiple Choice Questions pdf
Que 11. The process which is catalysed by one of the products formed during the reaction is known
(A) Auto-catalysis (B) Anti-catalysis
(C) Negative catalysis (D) Acid catalysis
Ans: (A) Auto-catalysis
Reason: Auto-catalysis as we need very less amount of catalyst but the reaction goes quickly.
Que 12. Which one of the following impurities present in the colloidal solution cannot be removed by electrodialysis?
(a) Sodium chloride (b) Potassium sulphate
(c) Urea (d) Calcium chloride
Ans: (c)
Reason: Electrodialysis involves the movement of ions towards oppositely charged electrodes. Urea being a covalent compound does not dissociate to give ions and hence it cannot be removed by electrodialysis. However, all the other given compounds are ionic which can undergo dissociation to give oppositely charged ions and thus can be separated.
Que 13. The migration of dispersion medium under the influence of electric potential is called:
(a) Cataphoresis (b) Electroosmosis
(c) Electrophoresis (d) Sedimentation
Ans: b)
Reason: The motion of a liquid through a membrane under the influence of an applied electric field is known as electroosmosis
Que 14. The movement of colloidal particles towards their respective electrodes in the presence of an electric field is known as:
(a) electrolysis (b) Brownian movement
(c) electrodialysis (d) electrophoresis
Ans: (d)
Que 15. Peptization denotes
(a) Digestion of food
(b) Hydrolysis of proteins
(c) Breaking and dispersion into the colloidal state
(d) Precipitation of solid from colloidal dispersion
Ans: (c)
Reason: Peptization comes under dispersion methods of preparation of colloids
Surface Chemistry Multiple Choice Questions pdf
Que 16. Colloidal gold is prepared by
(a) Mechanical dispersion (b) Peptization
(c) Bredig’s Arc method (d) Hydrolysis
Ans: (c)
Reason: Colloidal gold is prepared by Bredig’s arc method.
Que 17. Peptization involves
(a) precipitation of colloidal particles
(b) the disintegration of colloidal aggregates
(c) evaporation of dispersion medium
(d) impact of molecules of the dispersion medium on the colloidal particles
Ans: (b)
Reason: Peptisation is the disintegration of colloidal aggregate
Que 18. An example of an associated colloid is:
(a) Vegetable oil (b) Rubber latex
(c) Soap solution (d) Milk
Ans: (c)
Reason: Soap solution is an example of associated colloid.
Que 19. Colloidal solution of arsenious sulphide is prepared by:
(a) Hydrolysis (b) Double decomposition
(c) Electro dispersion method (d) Peptization
Ans: (b)
Reason: Arsenious sulphide is prepared by the double decom[1]position.
Surface Chemistry Multiple Choice Questions pdf
Que 20. The effect of pressure on adsorption is high if:
(a) Temperature is high
(b) Temperature is low
(c) Temperature is neither very low nor very high
(d) Charcoal piece is taken in place of charcoal powder
Ans: (b)
Reason: The effect of pressure on adsorption is high when the temperature is low
Que 21. Which of the following is the correct Freundlich’s formula:
(a) w/m = kP1/n (b) w/m = kP2n (c) w/m = kPn (d) m/w = kP1/n
Ans: (a)
Reason: Freundlich proposed a mathematical equation w/m = kP1/n.
Que 22. If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as:
(a) Foam (b) Sol (c) Emulsion (d) Gel
Ans: (d)
Reason: If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as a gel. For example, jellies, cheese and butter
Que 23. The diameter of colloidal particle ranges from:
(a) 10–9 m to 10–6 m (b) 10–6 m to 10–3 m
(c) 10–12 m to 10–9 m (d) 10–3 m to 10–6 m
Ans: (a)
Reason: The diameter of colloidal particles ranges from 10–9 to 10–6 m
Que 24. The capacity of an ion to coagulate a colloidal solution depends upon:
(a) Nature of charge (b) Amount of charge
(c) Its shape (d) Both (a) and (b)
Ans: (d)
Reason: Coagulating value of an electrolyte is directly proportional to the valency of the active ions, that is, the magnitude of charge, so the capacity of an ion to coagulate a colloidal solution depends upon the nature and magnitude of charge it carries.
Que 25. Which of the following is used for the destruction of colloids:
(a) Ultrafiltration (b) Adding electrolyte
(c) Both (a) and (b) (d) Dialysis
Ans: (b)
Reason: Negative ions cause precipitation of positively charged solute particles and vice versa. Therefore, the addition of electrolytes disrupts the colloidal nature of a colloidal solution.
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Surface Chemistry Multiple Choice Questions pdf
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