Chapter-5 Surface Chemistry MCQs
Q 41.: Which of the following is not an example of surface phenomenon ?
(A) Dissolution
(B) Corrosion
(C) Homogenous catalysis
(D) Peptization
Option – C
Q 42.: Tyndall effect confirms the
(A) gravity effect on the colloidal particles
(B) light scattering by the colloidal particles
(C) Brownian motion of the colloidal particles
(D) heterogeneous nature of colloidal sols.
Option – D
Q 43.: In Freundlich adsorption isotherm x/m = Kp1/n, the value of ‘n’ at low pressure is
(A) more than one
(B) less than one
(C) equal to one
(D) from zero to one
Option – D
Q 44.: 9. 3g of activated charcoal was added to 50 ml of acetic acid solution (0.06 M) in a flask. After an hour it was filtered and the strength of filtrate was found to be 0.042 M. The amount of acetic acid adsorbed per gram of charcoal is
(A) 48 mg
(B) 54 mg
(C) 45 mg
(D) 84 mg
Option – B
Q 45.: 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
Option – D
Q 46.: Because of adsorption _______
(A) Surface energy decreases
(B) Surface energy increases
(C) Surface energy remain constant
(D) Surface energy first decrease than increase
Option – A
Q 47.: By which other name the adsorption of gases on the solid surface is known ?
(A) Evaporation
(B) Sorption
(C) Condensation
(D) Surface tension
Option – C
Q 48.: 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) Positive catalyst
Option – B
Q 49.: According to Freundlich adsorption isotherm, which of the following is correct?
(A) x/m ∝ p1
(B) x/m ∝ p1/n
(C) x/m ∝ pº
(D) All are correct of different ranges of temperature
Option – D
Q 50.: Cottrell precipitator is used to
(A) Purification of air by gaseous pollutant
(B) Precipitate carbon particles from smoke
(C) Purify the ordinary drinking water
(D) Precipitate salts in qualitative analysis
Option – B
Q 51.: During the adsorption of gas on the surface of solid, which of the following is true?
(A) ∆G < 0, ∆H > 0, ∆S < 0
(B) ∆G > 0, ∆H < 0, ∆S < 0
(C) ∆G < 0, ∆H < 0, ∆S < 0
(D) ∆G < 0, ∆H < 0, ∆S > 0
Option – C
Q 52.: The best coagulant for the precipitation of Fe(OH)3 sol is
(A) Na2HPO3
(B) NaNO3
(C) Na3PO4
(D) Na2SO4
Option – C
Q 53.: The movement of colloidal particles towards the oppositely charged electrodes on passing electric current is known as
(A) Tyndall effect
(B) Electrophoresis
(C) Brownian movement
(D) None of these
Option – B
Q 54.: Identify the positively charged colloid.
(A) Haemoglobin
(B) As2S3
(C) Clay
(D) Gold sol
Option – A
Q 55.: The oxide of nitrogen which acts as a catalyst in lead chamber process is
(A) NO
(B) NO2
(C) N2O4
(D) N2O5
Option – A
Q 56.: Which of the following can adsorb larger volume of hydrogen gas?
(A) Finely divided platinum
(B) Small pieces of palladium
(C) Colloidal solution of palladium
(D) A single metal surface of platinum
Option – C
Q 57.: Which of the following substances is not an adsorbent ?
(A) Clay
(B) Silica gel
(C) Alumina
(D) Sugar
Option – D
Q 58.: Which statement is correct for physical adsorption ?
(A) It is fast process
(B) The value of adsorption enthalpy is low
(C) Uni-molecular layer is formed on the adsorbent
(D) Generally results at high temperature
Option – B
Q 59.: Which of the following gaseous molecule has maximum physical adsorption enthalpy
(A) He
(B) H2
(C) O2
(D) H2O
Option – D
Q 60.: A colloidal system in which liquid is dispersed phase and solid is dispersion medium is classified as
(A) Gel
(B) Sol
(C) Emulsion
(D) Aerosol
Option – A