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12th Chemistry Weekly Test - 4 ( Surface Chemistry )

St. Britto Hr. Sec. School - Madurai

12th Chemistry Weekly Test - 4 ( Surface Chemistry )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

_______is a measure of protecting power of a colloid

Colloid number
Coagulation number
Gold number
Sol number

According to Freundlich adsorption isotherm,

\(\frac { x }{ m } =kp\)
\(\frac { m }{ x } =(kp)^{ \frac { 1 }{ n } }\)
\(\frac { x }{ m } =kp^{ \frac { 1 }{ n } }\)
\(\frac { x }{ m } =\frac { k }{ p^{ \frac { 1 }{ n } } } \)

Collodion is a 4% solution of which one of the following compounds in alcohol - ether mixture?

Nitroglycerine
Cellulose acetate
Glycoldinitrate
Nitrocellulose

Extent of physisorption of a gas increases with______

increase in temperature
decrease in surface area of adsorbent
decrease in pressure
decrease in temperature

Which one of the following is correctly matched?

Emulsion - Smoke
Gel - butter
foam - Mist
whipped cream - sol

The phenomenon observed when a beam of light is passed through a colloidal solution is

Cataphoresis
Electrophoresis
Coagulation
Tyndall effect

When the surface area of the adsorbent increases, adsorption______

increases
decreases
remains constant
first decreases and then increases

The platinum catalyst used in the oxidation of SO₂ by contact process is poisoned by

As₂O₃
V₂O₅
Fe₂O₃
CuCl₂

Brownian movement of colloidal particles is a______ property.

Kinetic
Electrical
Optical
Magnetic

If x is the amount of adsorbate and m is the amount of adsorbent, which of the following relations is not related to adsorption process?

^x/_m = f(P) at constant T
^x/_m= f(T) at constant P
P = f(T) at constant ^x/_m
^x/_m= PT

The flocculation and setting down of the sol particles is called_______

Tyndall effect
Brownian movement
Electro osmosis
Coagulation

Which one of the following does not involve coagulation?

.formation of delta
peptisation
clotting of blood
tanning of leather

Auto catalysis is observed in the reaction given below.

CH₃COOC₂H₅ + H₂O\(\longrightarrow \) CH₃COOH + C₂H₅OH

Identify the auto catalyst.

CH₃COOC₂H₅
H₂O
CH₃COOH
C₂H₅OH

Colloids are purified by

precipitation
coagulation
dialysis
filtration

Argyrol is______

colloidal silver
colloidal antimony
colloidal gold
milk of magnesia

______is an example of O/W type emulsion.

butter
cream
milk
curd

The combination of the two layers of charges around the sol particle is called

Brownian movement
Tyndall effect
Helmholtz double layer
None of these

Adsorption is accompanied by

decrease in free energy
increase in free energy
increase in entropy
both (b) and (c)

Dispersed Phase

Dispersion Medium

Name

Liquid

\(\underline { X } \)

Liquid Aerosol

\(\underline { Y } \)

Solid

Solid form

The X and Y are _ and.

Gas, Liquid
Gas, Solid
Gas, Gas
Solid, Gas

In case of physical adsorption, there is desorption when

temperature increases
temperature decreases
pressure increases
concentration increases

This adsorption is irreversible

Vanderwaal's adsorption
Physical adsorption
Chemical adsorption
All the above

Match the following

A

Pure nitrogen

i)

Chlorine

B

Haber process

ii)

Sulphuric acid

C

Contact process

iii)

Ammonia

D

Deacons

Process

iv)

sodium azide (or) Barium azide

Which of the following is the correct option?

A B C D
(i) (ii) (iii) (iv)
A B C D
(ii) (iv) (i) (iii)
A B C D
(iii) (iv) (ii) (i)
A B C D
(iv) (iii) (ii) (i)

Emulsifying agent used for O/W type emulsion is:

proteins
heavy metal salts of fatty acids
long chain alcohol
lamp black

For chemisorption, which is wrong?

irreversible
it requires activation energy
it forms multimolecular layers on adsorbate
surface compounds are formed

Pick out the dispersion method of preparation of colloids

oxidation
change of physical state
reduction
peptisation

Which among the following true regarding adsorption?

(i) Adsorption is a spontaneous process
(ii) Adsorption is always accompanied by increase in free energy.
(iii) Adsorption is an endothermic process
(iv) Adsorption can occur in all interfacial surfaces.

only (ii)
(ii) and (iii)
only (i)
(i) and (iv)

To stablize the emulsion ____ is added.

stabilising agent
emulsifying agent
standardizing agent
none of the above

In an electrical field, the particles of a colloidal system move towards cathode. The coagulation of the same sol is studied using K₂SO₄ (i), Na₃PO₄ (ii), K₄[Fe(CN)₆] (In) and NaCl (iv) Their coagulating power should be

II > I > IV > III
III > II > I > IV
I > II > III > IV
none of these

The impurity present in the colloidal partide is

electrolytes
solute
both (a) and (b)
neither (a) or (b)

The dispersion of a precipitated material into colloidal solution by the action of an electrolyte in called

ultrafiltration
electro dispersion
peptisation
all the above

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