Top 80+ Solved Colloidal Dispersion MCQ Questions Answer
Q. Dispersion of acacia in water gives the colloid of type:
a. association
b. negative
c. neutral
d. positive
Q. Addition of alcohol to a hydrophilic colloid leads to:
a. crystallization
b. hydration
c. precipitation
d. stabilization
Q. The critical value of zeta potential (in milli volts) for a stable colloid (except gold sol) is:
a. from 20 to 50
b. from 50 to 100
c. less than 20
d. mor than 100
Q. If kinetic energy of interaction is about 25 kT (Where k is gas constant), the system can be consideredto have:
a. deflocculated state
b. long half life
c. short half life
d. weak attractiton forces
Q. In foams, the dispersed phase and dispersion medium, respectively, are:
a. gas and liquid
b. gas and solid
c. liquid and gas
d. solid and gas
Q. The characteristic of a lyophobic sol is that:
a. electrolytes in small amounts induce stabilization
b. it is reversible
c. particles have high electric charge
d. viscosity increases by the presence of particles
Q. Hydrosol refers to a system in which the dispersed phase and dispersion medium, respectively, are:
a. gas and water
b. liquid and water
c. solid and water
d. water and solid
Q. Electrodialysis is used, when impurities in a sol are:
a. amphiphiles
b. colloids
c. electrolytes
d. nonelctrolytes
Q. Under ultramicroscope, colloid particles appear as:
a. bright specks against dark background
b. concentric rings
c. dark specks against bright background
d. fluorescent specks
Q. Which one of the following properties is extensively applied for determining the molecular weight ofpolymer?
a. depression of freezing point
b. elevation of boiling point
c. lowering of vapour pressure
d. osmotic pressure
Q. In the determination of the gold number of a protective colloid, the endpoint is indicated by:
a. measuring the change in particle size
b. noting sedimentation volume of gold
c. observing the color change
d. weighing of the precipitate
Q. The semipermeable membrane used in haemodialysis is:
a. cellophane
b. cellulose acetate
c. polyethene
d. polyvinyl acetate
Q. The stability of acacia in water is due to:
a. formation of micelles
b. hydration of solids
c. lowering interfacial tension
d. presence of electrical charge
Q. The molecular weight of dispersed solids in a colloidal system can be determined using aninstrument:
a. ultracentrifuge
b. ultrafilters
c. ultramicroscope
d. zeta meter