Surface Chemistry Test

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Surface Chemistry Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

The substance that gets adsorbed on the surface of the solid is called

A
Micelle

B
Adsorbate

C
Inner phase

D
Adsorbent

Solution

Explanation:

The substance that gets adsorbed on the surface is known as adsorbate.
Question 2
1 / -0

Water vapours are adsorbed by

A
Anhydrous C_aCl₂

B
Organic dye

C
Silica gel

D
Charcoal

Solution

Explanation:

Water vapours gets adsorbed by Silica gel.
Question 3
1 / -0

Adsorption is accompanied by

A
Decrease in enthalpy of the system

B
TΔS for the process is negative

C
All are correct

D
Decrease in entropy of the system

Solution

Explanation:

Adsorption involve decrease in entropy because gas when gas adsorbed randomness decreases. Also it is exothermic process.
Question 4
1 / -0

The phenomenon in which adsorption and absorption takes place simultaneously is called

A
Chemisorptions

B
Desorption

C
Sorption

D
Physisorption

Solution

Explanation:

Adsorption and absorption is commonly known as sorption.
Question 5
1 / -0

Which of the following is true about chemisorption?

A
None of these

B
It usually occurs at low temperature

C
It is reversible in nature

D
It is highly specific in nature

Solution

Explanation:

Chemical Reaction take place between adsorbate and adsorbent in chemisorptions. Therefore it is specific in nature.
Question 6
1 / -0

Adsorption increases when

A
Temperature decreases

B
None of these

C
Temperature increases

D
Temperature remains constant

Solution

Explanation:

With increase in temperature, the molecules of absorbent come into vibratory motion and hence adsorption decreses. With low temperature molecules are not in motion hence greater adsorption.
Question 7
1 / -0

Which among the following is a property of physisorption?

A
High enthalpy of adsorption

B
All of the above

C
Non – specific in nature

D
Irreversibility

Solution

Explanation:

In physisorption no chemical reaction, only physical interactions hence, not specific.
Question 8
1 / -0

Powdered substances are more effective adsorbents than their crystalline forms because

A
Pressure increases

B
Temperature increases

C
Surface area increases

D
All of the above

Solution

Explanation:

Greater the surface area, greater will be the area available for adsorption.
Question 9
1 / -0

Which among the following is true for chemisorptions?

A
Irreversible in nature

B
Does not form surface complex

C
Occurs at low temperature

D
Heat of adsorption is low

Solution

Explanation:

As chemical reaction takes place in chemisorption, it cant be reversed.
Question 10
1 / -0

In physisorption, adsorption is generally

A
Bilayered

B
Multilayered

C
None of these

D
Monolayered

Solution

Explanation:

Physiorption includes physical forces of attraction, hence, multilayered is possible.

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Surface Chemistry Test - 1

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Surface Chemistry Test - 1

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Question 1

Micelle

Adsorbate

Inner phase

Adsorbent

Solution

Question 2

Anhydrous CaCl2

Organic dye

Silica gel

Charcoal

Solution

Question 3

Decrease in enthalpy of the system

TΔS for the process is negative

All are correct

Decrease in entropy of the system

Solution

Question 4

Chemisorptions

Desorption

Sorption

Physisorption

Solution

Question 5

None of these

It usually occurs at low temperature

It is reversible in nature

It is highly specific in nature

Solution

Question 6

Temperature decreases

None of these

Temperature increases

Temperature remains constant

Solution

Question 7

High enthalpy of adsorption

All of the above

Non – specific in nature

Irreversibility

Solution

Question 8

Pressure increases

Temperature increases

Surface area increases

All of the above

Solution

Question 9

Irreversible in nature

Does not form surface complex

Occurs at low temperature

Heat of adsorption is low

Solution

Question 10

Bilayered

Multilayered

None of these

Monolayered

Solution

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Anhydrous C_aCl₂