Surface Chemistry  MCQs

MCQs of Surface Chemistry

Showing 151 to 160 out of 203 Questions
13 14 15 16 17 18
151.
During the formation of micelle _____ .
(a) ΔH = +ve  ΔS = +ve
(b) ΔH = -ve  ΔS = -ve
(c) ΔH = -ve  ΔS = +ve
(d) ΔH = +ve  ΔS = -ve
Answer:

Option (a)

152.
Which of the following is not associated with colloids ?
(a) Tyndall effect
(b) Dialysis
(c) Brownian movement
(d) Corrosion
Answer:

Option (d)

153.
Why is Tyndall effect not observed in very dilute solution of copper sulphate ?
(a) It is colloidal sol
(b) It is ionic.
(c) It is a coloured solution itself
(d) It is a true solution
Answer:

Option (d)

154.
Which of the following involves dispersion and condensation both ?
(a) Excessive cooling
(b) Peptization
(c) Bredig arc method
(d) Hydrolysis
Answer:

Option (c)

155.
For preparing lyophobic sols, which of the following condensation methods is not included ?
(a) Preparation of Fe(OH)3 sol by hydrolysis of FeCl3
(b) Exchange of solvent
(c) Excessive cooling
(d) Bredig arc method
Answer:

Option (d)

156.
What is the name of the method in which soluble impurities are removed from the sol with the help of semi permeable membrane ?
(a) Pyrolysis
(b) Dialysis
(c) Photolysis
(d) Peptization
Answer:

Option (b)

157.
Which of the following helps in digestion of fat in the stomach ?
(a) Emulsification
(b) Dialysis
(c) Dilution
(d) All of the above
Answer:

Option (a)

158.
What is the name of the process if colloids associate and change to insoluble precipitate ?
(a) Coagulation
(b) Precipitation
(c) Peptization
(d) Dialysis
Answer:

Option (a)

159.
What is the name of the process when concentration of electrolyte is low and colloidal particles associate but do not precipitate ?
(a) Coagulation
(b) Flocculation
(c) Peptization
(d) Dialysis
Answer:

Option (b)

160.
Emulsion of asphalt for construction of road is prepared in _____ .
(a) water
(b) oil
(c) petrol
(d) kerosene
Answer:

Option (a)

Showing 151 to 160 out of 203 Questions
13 14 15 16 17 18