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12th Chemistry Weekly Test - 3 ( Surface Chemistry )

St. Britto Hr. Sec. School - Madurai

12th Chemistry Weekly Test - 3 ( Surface Chemistry )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

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

Cataphoresis
Electrophoresis
Coagulation
Tyndall effect

Colloidal medicines are more efffective because

they are dean
they are easy to prepare
the germs move towards them
they are easily assimilated and adsorbed

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

Oil soluble dye is mixed with emulsion and emulsion remains colourless then, the emulsion is

O/W
W/O
O/O
W/W

Pick out the dispersion method of preparation of colloids

oxidation
change of physical state
reduction
peptisation

The place where rivers meet the sea is the delta region. Which of the following process is responsible for the formation of delta?

Emulsification
Peptisation
Gel formation
Coagulation

Which of the following is not a favourable condition for physical adsorption?

high pressure
negative \(\triangle\)H
higher critical temperature of absorbate
high temperature

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As₂S₃ are given below
(I) (NaCl) = 52 (II) (BaCl₂) = 0.69 (III) (MgSO₄) = 0.22
The correct order of their coagulating power is

III > II > I
I > II > III
I > III > II
II > III>I

Colloidal solution of ink is prepared by

mechanical dispersion
electro dispersion
ultrasonic dispersion
peptisation

Colloidal milk of magnesia is used

as germ killer
as fertilizer
for stomach disorders
as tonic

Statement:
To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?

It is not true, ferric chloride is a poison.
It is true, Fe³⁺ ions coagulate blood which is a negatively charged sol
It is not true; ferric chloride is ionic and gets into the blood stream.
It is true, coagulation takes place because of formation of negatively charged sol with Cl^-.

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

Nitroglycerine
Cellulose acetate
Glycoldinitrate
Nitrocellulose

The process of separation of emulsion into two separate layers is called______

Emulsification
Deemulsification
Coagulation
Flocculation

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

An example of positively charged colloid is_____

clay
starch
Ag
haemoglobin

Emulsifying agent used for O/W type emulsion is:

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

The multilayer adsorption of gases on solids take place in

physical adsorption
chemisorption
sols
active centres

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

sol
foam
liquid aerosol
solid aerosol

Name the colloid in which the dispersed phase is solid and dispersion medium is liquid

gel
aerosol
sol
solid sol

When the operation force between the absorbent and adsorbate is weak Vander waal's force, then it is called

physical adsorption
chemical adsorption
Vanderwaal's adsorption
both (a) and (c)

Part - B

Generic 2 - Answer All Question

What is the difference between a sol and a gel?

Give three uses of emulsions.

What is the formula for Ziegler - Natta catalyst?

What is Helmholtz double layer?

A solid catalyst is more effective in its finely divided form - Justify.

What is Tyndall effect?

Explain O/W and W/O types of emulsions with examples.

What are the methods by which colloids are prepared?

What causes Brownian movement in a colloid?

Why are lyophillic colloidal sols are more stable than lyophobic colloidal sol.

Part - C

Generic 3 - Answer All Question

What are emulsifying agent?

Write a note on auto catalysis?

How are colloidal solution of ink and graphite prepared?

Explain the meaning of the statement.
'Adsorption is a surface phenomenon'.

Give three examples of enzyme catalyzed reactions.

Write a note.

(i) Positive catalyst
(ii) Negative catalyst

Define adsorption.

Write the optical properties of colloids with diagram.

What are the advantages of Brownian movement?

Write a note on Ultrafilteration?

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