Surface Chemistry Test

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Surface Chemistry Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Chromatography is based on the principle of

A
Chemical adsorption

B
Absorption

C
Physical adsorption

D
Hydrogen bonding

Solution

Adsorption chromatography is a process of separation of components in a mixture based on the relative differences in adsorption of components to the stationary phase present in the chromatography column.
Question 2
1 / -0

The extent of adsorption increases with the

A
Increase in the surface area of the adsorbent

B
Decrease in the pressure of the gas

C
Increase in temperature

D
Decrease in the surface area of the adsorbent

Solution

Both physisorption and chemisorption increases with increase in surface area of the adsorbent. Surface area can be increased by powdering the adsorbent.
Question 3
1 / -0

The physical adsorption is due to

A
Covalent bond

B
Hydrogen bonding

C
Strong electrostatic forces of attraction

D
Vander waal’s forces

Solution

If the force of attraction between adsorbent and adsorbate is weak van der Waals force, then it is called physical adsorption or physisorption.
Question 4
1 / -0

Substances that alter the rate of a chemical reaction without being used up in a chemical reaction is known as

A
Promoters

B
Poisons

C
Catalyst

D
Inhibitors

Solution

Catalyst only increases or decreases the activation energy of a reaction. It does not get used up in reaction.
Question 5
1 / -0

Substance that enhances the activity of a catalyst is known as

A
Inhibitor

B
Promoter

C
Coenzyme

D
Poison

Solution

Promoter by either stepping the activation energy of a reaction, or by inserting itself between the molecules of catalyst increases the rate of reaction.
Question 6
1 / -0

Enzymes are

A
Catalyst found in organisms

B
Very active vegetable catalyst

C
Synthetic catalyst

D
Substances made by chemists to activate washing powder

Solution

Enzymes are biological catalyst, they catalize different chemical reactions in body.
Question 7
1 / -0

A biochemical catalyst is

A
Nitrogen molecule

B
A carbohydrate

C
An enzyme

D
An amino acid

Solution

Enzymes are biological catalyst, they catalize different chemical reactions in body.
Question 8
1 / -0

The number of phases in colloidal system are

A
Three

B
One

C
Two

D
Four

Solution

Dispersed phase, dispersion medium
Question 9
1 / -0

The process of separation of colloids by passing through semi permeable membrane is called

A
Filtration

B
Dialysis

C
Electrophoresis

D
Ultrafilteration

Solution

Dialysis we use, salt solution of approximately same concentration outside the artificial blood capillary, so that urea comes out of the blood, but other useful substances like NaCl , blood cell etc does not. Blood is a colloid.
Question 10
1 / -0

Liquid – liquid sols are known as

A
Aerosols

B
Foam

C
Emulsions

D
Gels

Solution

Liquid in liquid sols are emulsions. Examples are milk, hair cream.

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Surface Chemistry Test - 4

Result

Surface Chemistry Test - 4

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SHARING IS CARING

Question 1

Chemical adsorption

Absorption

Physical adsorption

Hydrogen bonding

Solution

Question 2

Increase in the surface area of the adsorbent

Decrease in the pressure of the gas

Increase in temperature

Decrease in the surface area of the adsorbent

Solution

Question 3

Covalent bond

Hydrogen bonding

Strong electrostatic forces of attraction

Vander waal’s forces

Solution

Question 4

Promoters

Poisons

Catalyst

Inhibitors

Solution

Question 5

Inhibitor

Promoter

Coenzyme

Poison

Solution

Question 6

Catalyst found in organisms

Very active vegetable catalyst

Synthetic catalyst

Substances made by chemists to activate washing powder

Solution

Question 7

Nitrogen molecule

A carbohydrate

An enzyme

An amino acid

Solution

Question 8

Three

One

Two

Four

Solution

Question 9

Filtration

Dialysis

Electrophoresis

Ultrafilteration

Solution

Question 10

Aerosols

Foam

Emulsions

Gels

Solution

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