Surface Chemistry Test

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Surface Chemistry Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Hydrophilic colloids are stable due to

A
Large size of particles

B
Negative charged particles

C
Layer of dispersion medium on their particles

D
Small size of particles

Solution

This makes the colloid stable.
Question 2
1 / -0

Which of the following methods is used for sol destruction?

A
Addition of an electrolyte

B
Diffusion through semi permeable membrane

C
Condensation

D
Dialysis

Solution

Electrolyte makes the colloid destroy.
Question 3
1 / -0

Liquid – liquid solutions are known as

A
Gel

B
Foam

C
Emulsions

D
Aerosols

Solution

Dispersed phase and dispersion medium both are liquids.
Question 4
1 / -0

Flocculation value is expressed in terms of

A
Moles/litre

B
Millimoles/litre

C
Grams/litre

D
Moles/millilitre

Solution

In colloidal chemistry,flocculation refers to the process by which fine particulates are caused to clump together into a floc.The unit in which it is measured is millimoles/litre.
Question 5
1 / -0

In aerosol the dispersion medium is

A
Solid

B
Gas

C
Plasma

D
Liquid

Solution

Dispersion medium is gas. Example of aerosols are fog, mist, and cloud.
Question 6
1 / -0

Fog is a colloidal solution of

A
Gas in liquid

B
Solid in gas

C
Liquid in gas

D
Gas in gas

Solution

Dispersed phase is liquid, dispersion medium is gas.
Question 7
1 / -0

The colloidal solution of two immiscible liquids is called

A
Aerosol

B
Gel

C
Emulsion

D
Sol

Solution

Dispersed phase is liquid, dispersion medium is liquid.
Question 8
1 / -0

The basic principle of Cottrell precipitator is

A
Peptization

B
Le Chatelier’s principle

C
Neutralization of charge on colloids

D
Stabilisation

Solution

It is used for decreasing air pollution by neutralizing the colloid.
Question 9
1 / -0

The size of the particle is enough to scatter light and exhibits Tyndall effect

A
1 – 100 nm

B
200 – 400 nm

C
200 – 2000 nm

D
2000 – 4000 nm

Solution

Colloids have an intermediate size between suspension and true solutions. The particle size is enough to scatter light and exhibits Tyndall effect.
Question 10
1 / -0

In which of the following systems, the dispersed phase and dispersion medium are both solid?

A
Foam

B
Dust storm

C
Colored glass

D
Paints

Solution

It is a Solid Sol type of colloid.

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Surface Chemistry Test - 7

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Surface Chemistry Test - 7

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SHARING IS CARING

Question 1

Large size of particles

Negative charged particles

Layer of dispersion medium on their particles

Small size of particles

Solution

Question 2

Addition of an electrolyte

Diffusion through semi permeable membrane

Condensation

Dialysis

Solution

Question 3

Gel

Foam

Emulsions

Aerosols

Solution

Question 4

Moles/litre

Millimoles/litre

Grams/litre

Moles/millilitre

Solution

Question 5

Solid

Gas

Plasma

Liquid

Solution

Question 6

Gas in liquid

Solid in gas

Liquid in gas

Gas in gas

Solution

Question 7

Aerosol

Gel

Emulsion

Sol

Solution

Question 8

Peptization

Le Chatelier’s principle

Neutralization of charge on colloids

Stabilisation

Solution

Question 9

1 – 100 nm

200 – 400 nm

200 – 2000 nm

2000 – 4000 nm

Solution

Question 10

Foam

Dust storm

Colored glass

Paints

Solution

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