B.Sc. First year
Undergraduate degree course Semester second Physical chemistry paper IV
Chapter - Colloidal State
Definition of colloids,
classification of colloids.
Solids in liquids (sols) : properties - kinetic, optical and electrical;
stability of colloids, protective action. Hardy - Schulze Law.
Liquids in liquids (emulsions) : types of emulsions, preparation.
Liquids in Solids (gels) : classification, preparation and properties, general applications of colloids.
Multiple Choice questions:
1.
A colloidal solution consists of
(a)
a dispersed phase
(b)
a dispersion medium
(c)
a dispersed phase in a dispersion medium
(d)
a dispersion medium in a dispersed phase
Answer.
(c)
2.
The sols in which the dispersed phase exhibits a definite affinity for the
medium or the solvent is called
(a)
lyophillic sols
(b)
lyophobic sols
(c)
emulsions
(d)
hydrosols
Answer.
(a)
3.
The scattering of light by the dispersed phase is called
(a)
Brownian movement
(b)
Tyndall effect
(c)
adsorption
(d)
electrophoresis
Answer.
(b)
4.
The lyophillic sols are
(a)
reversible in nature
(b)
irreversible in nature
(c)
sometimes reversible sometimes nonreversible
(d)
none of the above
Answer.
(a)
5.
The dispersal of a precipitated material into colloidal solution by the action
of an electrolyte in solution is called
(a)
coagulation
(b)
dialysis
(c)
peptization
(d)
ultra-filtration
6.
The process of removing ions (or molecules) from a sol by diffusion through a
permeable membrane is called
(a)
ultra-filtration
(b)
dialysis
(c)
electrophoresis
(d)
osmosis
Answer.
(b)
7.
_______ do not show Tyndall effect
(a)
true solution
(b)
colloidal solutions
(c)
suspensions
(d)
none of these
Answer.
(a)
8.
The continuous rapid zig-zag movement executed by a colloidal particle in the dispersion
medium is called
(a)
Tyndall effect
(b)
Brownian movement
(c)
electrophoresis
(d)
peptization
Answer.
(b)
9.
The explanation of Brownian movement was given by
(a)
Robert Brown
(b)
Robert Boyle
(c)
Albert Einstien
(d)
Tyndall
Answer.
(c)
10.
The presence of the double layer in colloids accounts for
(a)
kinetic properties
(b)
electrical properties
(c)
optical properties
(d)
stability of colloids
Answer.
(b)
11.
If the sol particles in a given colloid moves towards the anode, they carry
(a)
positive charge
(b) negative charge
(c)
no charge
(d)
sometimes positive sometimes negative charge
Answer.
(b)
12.
A sol of Ferric chloride moves to the negative electrode. The colloidal
particles carry
(a)
no charge
(b)
positive charge
(c)
negative charge
(d)
none of these
Answer.
(b)
13.
The movement of the dispersion medium under the influence of applied potential
is known as
(a)
osmosis
(b)
diffusion
(c)
electro-osmosis
(d)
electrophoresis
Answer.
(c)
14.
The _______ the gold number of a hydrophilic colloid, the greater is its
protective power
(a)
higher
(b)
lower
(c)
constant
(d)
none of these
Answer.
(b)
15.
The charge on the sol particles is due to _______ of ions common to the
particles from the dispersion medium
(a)
selective adsorption
(b)
selective coagulation
(c)
selective peptisation
(d)
selective absorption
Answer.
(a)
16.
An emulsion is a colloidal solution of a _______ dispersed in another liquid
(a)
solid
(b)
liquid
(c)
gas
(d)
medium
Answer.
(b)
17.
A gel is a colloidal system in which a _______ is dispersed in a _______
medium.
(a)
solid, liquid
(b)
liquid, solid
(c)
liquid, liquid
(d)
liquid, gas
Answer.
(b)
18.
The human kidneys purify the blood by _______ through natural membranes
(a)
osmosis
(b)
diffusion
(c)
dialysis
(d)
emulsification
Answer.
(c)
19.
Milk is an example of
(a)
sol
(b)
gel
(c)
emulsion
(d)
true solution
Answer.
(c)
20.
The function of an emulsifier is to
(a)
coagulate a colloidal solution
(b)
stabilise an emulsion
(c)
stabilise a sol
(d)
electrify a colloidal solution
Answer.
(b)
21.
Ice cream is a dispersion of _______ in cream
(a)
water
(b)
water vapour
(c)
ice
(d)
cooling agent
Answer.
(c)
22.
The function of alum used for the purification of water is to
(a)
coagulate the sol particles
(b)
disperse the sol particles
(c)
emulsify the sol particles
(d)
absorb the sol particles
Answer.
(a)
23.
The macromolecules possess
(a)
high viscosity
(b)
high molecular weights
(c)
show a weak Tyndall effect
(d) all of these
Answer.
(d)
24.
Fog is an example of colloidal system of
(a)
liquid dispersed in a liquid
(b)
solid dispersed in a solid
(c)
gas dispersed in a liquid
(d)
liquid dispersed in a gas
Answer.
(d)
25.
Gold number gives
(a)
the number of gold atoms present is one gram of gold
(b)
the number of gold atoms required to coagulate one g of the colloidal solution
(c)
the number of gold atoms present in one gram of gold alloy
(d)
none of the above
Answer.
(d)
26.
Which of the following does not show Tyndall effect?
(a)
colloidal solution
(b)
isotonic solution
(c)
both of these
(d)
none of these
Answer.
(b)
27.
Smoke is an example of
(a)
solid dispersed in solid
(b)
solid dispersed in liquid
(c)
solid dispersed in gas
(d)
gas dispersed in solid
Answer.
(c)
28.
Which of the following is not a colloidal solution?
(a)
brine solution
(b)
fog
(c)
smoke
(d)
butter
Answer.
(a)
29.
The cleansing action of soap is due to
(a)
hydrolysis of salt present in soap
(b)
ionisation of salt present in soap
(c)
high molecular mass of soap
(d)
emulsification properties of soap
Answer.
(d)
More questions
1)
Mathematical concepts MCQ
2)
Gaseous State MCQ
3)Liquid
State MCQ
4)
Solid State MCQ
5)Chemical
kinetics MCQ
6)
Catalysis MCQ
7)
Colloidal State MCQ
For regular updates Join with us on TELEGRAM
 Semester second, Physical chemistry paper IV ){kind=link}