Explore topic-wise MCQs in Surface Chemistry.

This section includes 26 Mcqs, each offering curated multiple-choice questions to sharpen your Surface Chemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

Arrange the following in decreasing Lewis acid strength -PF3, PCI3, PBr3, Pl3
A. Pl3 > PBr3 > PCl3 > PF3
B. PF3 > PCl3 > PBr3 > Pl3
C. PCl3 > PBr3 > Pl3 > PF3
D. PBr3 > Pl3 > PF3 > PCl3
Answer» B. PF3 > PCl3 > PBr3 > Pl3
Discussion
2.

Movement of dispersion medium under the influence of electric field is known as
A. electrodialysis
B. electrophoresis
C. electroosmosis
D. cataphoresis
Answer» D. cataphoresis
Discussion
3.

Why is alum added to water containing suspended impurities?
A. To make acolloidal solution
B. To coagulate the suspended impurities
C. To remove impurities of calcium and magnesium
D. To protect the colloidal solution from gening precipitated
Answer» C. To remove impurities of calcium and magnesium
Discussion
4.

At CMC (critical micelle concentration) the surface molecules
A. dissociate
B. associate
C. become bigger in size due to adsorption
D. become smaller in size due to decomposition
Answer» C. become bigger in size due to adsorption
Discussion
5.

Which of the following is not a method for coagulation of lyophobic sols?
A. By electrophoresis
B. By mixing oppositely charged sols
C. By adding electrolyte
D. By adding a protective colloid
Answer» E.
Discussion
6.

Shape selective catalysis is a reaction catalysed by
A. zeolite
B. enzymes
C. platinum
D. Ziegler-Natta catalyst
Answer» B. enzymes
Discussion
7.

Presence of traces of arsenious oxide (As2O3) in the reacting gases SO2 and O3 in presence of plantinised asbestos in contact process acts as
A. catalytic promoter
B. catalytic poison
C. dehydrating agent
D. drying agent
Answer» C. dehydrating agent
Discussion
8.

Tyndall effect confirms the
A. gravity effect on the sol. particles
B. light scattering by the sol. particles
C. heterogeneous nature of sols.
D. Brownian motion of the sol. particles
Answer» D. Brownian motion of the sol. particles
Discussion
9.

Which of the following is not correct for enzyme catalysis?
A. The enzyme activity is maximum at optimum pH which is between 5-7
B. Each enzyme is specific for a given reaction
C. The favourable temperature range of enzyme activity is between 25-37 C
D. The enzymatic activity is increased in presence of certain substances.called co-enzymes
Answer» D. The enzymatic activity is increased in presence of certain substances.called co-enzymes
Discussion
10.

Which one of the following is alyophilic colloid?
A. Milk
B. Gum
C. Fog
D. Blood
Answer» C. Fog
Discussion
11.

Volume of one mole of any gas at NTP is
A. 11.2 litre
B. 22.4 litre
C. 10.2 litre
D. 22.8 litre
Answer» C. 10.2 litre
Discussion
12.

Fog in an example of colloidal system of
A. liquid in gas
B. gas in liquid
C. solid in gas
D. gas in solid
Answer» B. gas in liquid
Discussion
13.

Which of the following will not form a colloidal system?
A. Solid-gas
B. Liquid-gas
C. Gas-gas
D. Gas-liquid
Answer» D. Gas-liquid
Discussion
14.

Substances which behave as normal electrolytes solution at low concentration and exhibit colloids properties at higher concentration are called
A. lyophilic colloids
B. lyophobic colloids
C. macromolecular colloids
D. associated colloids
Answer» E.
Discussion
15.

A colloidal system is which liquid is dispersed phase and solid is dispersion medium is classified as
A. gel
B. sol
C. emulsion
D. aerosol
Answer» B. sol
Discussion
16.

Which of the following can adsorb larger volume of hydrogen gas?
A. Finely divided platinum
B. Colloidal solution of palladium
C. Small pieces of palladium
D. A single metal surface of platinum
Answer» C. Small pieces of palladium
Discussion
17.

Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask?
A. H2
B. O3
C. N2
D. SO2
Answer» E.
Discussion
18.

Which kind of catalysis can be explained on the basis of adsorption theory ?
A. Homogeneous catalysis
B. Heterogeneous catalysis
C. Negative catalysis
D. Auto catalysis
Answer» C. Negative catalysis
Discussion
19.

The activity of an enzyme becomes ineffective
A. at low temperature
B. at atmospheric pressure
C. at high temperature
D. in aqueous medium
Answer» D. in aqueous medium
Discussion
20.

Which of the following types of metals make the most efficient catalyst?
A. Alkali metals
B. Transition metals
C. Inner transition metals
D. Alkaline earth metals
Answer» C. Inner transition metals
Discussion
21.

The oxide of nitrogen which acts as a catalyst in lead chamber process is
A. NO
B. NO2
C. N2O4
D. H2O5
Answer» B. NO2
Discussion
22.

The formation of micelles takes place only above
A. critical temperature
B. Kraft temperature
C. inversion temperature
D. absolute temperature
Answer» C. inversion temperature
Discussion
23.

The size of colloidal particles ranges between
A. 10-7 10-8 cm
B. 10-9 10-11 cm
C. 10-4 10-7 cm
D. 10-2 10-3 cm
Answer» D. 10-2 10-3 cm
Discussion
24.

Which of the following acts as the best coagulating agent for ferric hydroxide sol?
A. Potassium ferrocyanide
B. Potassium chloride
C. Potassium oxalate
D. Aluminium chloride
Answer» B. Potassium chloride
Discussion
25.

Which of the following is not a method of removing impurities from a colloidal sol?
A. Electrodialysis
B. Ultrafiltration
C. Ultra centrifugation
D. Distillation
Answer» E.
Discussion
26.

The substances which behave as colloidal solutions at higher concentration are called
A. associated colloids
B. multimolecular colloids
C. macromolecular colloids
D. protective colloids
Answer» B. multimolecular colloids
Discussion