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12th Chemistry Weekly Test - 1 ( Surface Chemistry )

St. Britto Hr. Sec. School - Madurai

12th Chemistry Weekly Test - 1 ( Surface Chemistry )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

On which of the following properties does the coagulating power of an ion depend ?

Both magnitude and sign of the charge on the ion.
Size of the ion alone
the magnitude of the charge on the ion alone
the sign of charge on the ion alone

The phenomenon of Tyndall's effect is not observed in

emulsion
colloidal solution
true solution
none

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

The Tyndall's effect associated with colloidal particles is due to

presence of charge
scattering of light
absorption of light
reflection of light

When temperature is raised, chemisorption________

increases
decreases
first decreases and then increases
first increases and then decreases

______is an example of O/W type emulsion.

butter
cream
milk
curd

Colloidal graphite is prepared by ______method.

eletrodispersion
mechanical dispersion
ultrasonic dispersion
peptisation

Colloidal solution of ink is prepared by
mechanical dispersion

electro dispersion

ultrasonic dispersion

peptisation
The dispersion medium is a liquid and the dispersed phase is a gas. Name the colloid
sol

foam

liquid aerosol

solid aerosol

Silver salt used in photography is

AgCl
AgNO₃
AgF
AgBr

In auto catalysis ___ acts as catalyst.

reactant
product
bothnone
none

Part - B

Generic 2 - Answer All Question

What happens when a colloidal sol of Fe(OH)₃ and AS₂O_s are mixed?
What are enzymes? Write a brief note on the mechanism of enzyme catalysis.

Give two important characteristics of physiscorption.

What is collodion?

Differentiate physisorption and chemisorption.

What are the methods by which colloids are prepared?

Part - C

Generic 3 - Answer All Question

How are colloidal solution of ink and graphite prepared?

Name two industrial process where heterogeneous catalysts are used.

For the coagulation of 100 ml of arsenious sulphide sol, 5 ml of 1 M NaCl is required. What is the flocculation value of NaCl?

Give three examples of enzyme catalyzed reactions.

How is coagulation brought about by addition of electrolytes?
What are the advantages of Brownian movement?

Part - D

Generic 5 - Answer All Question

Write a note on Freundlich adsorption isotherm.

Explain the electrical property of colloids with a neat diagram.

Name the method to deduce the charge of the sol particle. Explain it with a neat diagram.
Write the characteristics of adsorption.

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