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
Inner phase

B
Micelle

C
Adsorbate

D
Adsorbent

Solution

In adsorption process, the molecular species or substance, which concentrates or accumulates at the surface is termed adsorbate.
Question 2
1 / -0

Which of the following is true about chemisorption?

A
It is reversible in nature

B
It usually occurs at low temperature

C
It results into multimolecular layers on adsorbent surface.

D
It is highly specific in nature

Solution

Chemisorption is highly specific in nature and it will occur only if there is some possibility of chemical bonding between adsorbent and adsorbate.
Question 3
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When silica gel and anhydrous calcium chloride are placed in an atmosphere of high humidity, then which of them will have more moisture in the bulk?

A
Anhydrous CaCl₂

B
Silica

C
Same in both

D
Data insufficient
Question 4
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Adsorption is accompanied by

A
TΔS for the process is negative

B
Decrease in entropy of the system

C
Decrease in enthalpy of the system

D
All are correct

Solution

Adsorption is accompanied by decrease in enthalpy as well as decrease in entropy of the system. Adsorption, therefore, is invariably an exothermic process.
Question 5
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Which of the following electrolytes will be the most effective in coagulating blood?

A
BaCl₂

B
CaCl₂

C
NaCl

D
FeCl₃
Question 6
1 / -0

Water vapours are adsorbed by

A
Anhydrous CaCl₂

B
Charcoal

C
Organic dye

D
Silica gel

Solution

Water vapours gets adsorbed by Silica gel, while absorbed by anhydrous calcium chloride.
Question 7
1 / -0

Zeigler-Natta catalyst used for polymerization of ethylene is basically

A
a zeolite

B
TiCl₄ + trialkylaluminium

C
powdered Cu

D
Pd + BaSO₄
Question 8
1 / -0

Which of the following statements regarding adsorption is not correct?

A
The process of adsorption is an exothermic process.

B
The substance being adsorbed is known as adsorbate.

C
The substance on which adsorption occurs is known as adsorbent.

D
The activation energy in chemisorption is smaller than that in physisorption.
Question 9
1 / -0

Which of the following statements regarding adsorption is not true?

A
The phenomenon of adsorption implies the presence of excess concentration of adsorbate at the surface of adsorbent.

B
The phenomenon of adsorption is due to the presence of residual forces at the surface of the body.

C
During adsorption, there occurs a decrease in free energy of the system.

D
During adsorption, there occurs an increase in entropy of the system.
Question 10
1 / -0

The efficiency of enzyme catalysis is due to its capacity to

A
form a strong enzyme-substrate complex

B
change the shape of the substrate

C
lower the activation energy of the reaction

D
form a colloidal solution in water

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Surface Chemistry Test - 1

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Surface Chemistry Test - 1

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Question 1

Inner phase

Micelle

Adsorbate

Adsorbent

Solution

Question 2

It is reversible in nature

It usually occurs at low temperature

It results into multimolecular layers on adsorbent surface.

It is highly specific in nature

Solution

Question 3

Anhydrous CaCl2

Silica

Same in both

Data insufficient

Question 4

TΔS for the process is negative

Decrease in entropy of the system

Decrease in enthalpy of the system

All are correct

Solution

Question 5

BaCl2

CaCl2

NaCl

FeCl3

Question 6

Anhydrous CaCl2

Charcoal

Organic dye

Silica gel

Solution

Question 7

a zeolite

TiCl4 + trialkylaluminium

powdered Cu

Pd + BaSO4

Question 8

The process of adsorption is an exothermic process.

The substance being adsorbed is known as adsorbate.

The substance on which adsorption occurs is known as adsorbent.

The activation energy in chemisorption is smaller than that in physisorption.

Question 9

The phenomenon of adsorption implies the presence of excess concentration of adsorbate at the surface of adsorbent.

The phenomenon of adsorption is due to the presence of residual forces at the surface of the body.

During adsorption, there occurs a decrease in free energy of the system.

During adsorption, there occurs an increase in entropy of the system.

Question 10

form a strong enzyme-substrate complex

change the shape of the substrate

lower the activation energy of the reaction

form a colloidal solution in water

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Anhydrous CaCl₂

BaCl₂

CaCl₂

FeCl₃

Anhydrous CaCl₂

TiCl₄ + trialkylaluminium

Pd + BaSO₄