Surface Chemistry Test

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Surface Chemistry Test - 3

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Weekly Quiz Competition

Question 1
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.

Solution

Adsorption is accompanied with decrease in entropy as the adsorbed molecules become more ordered. Hence, the statement in the option (4) is incorrect regarding the phenomenon of adsorption.
Question 2
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.

Solution

The activation energy in chemisorption is larger than that in physisorption. Consequently, increase in temperature initially increases the rate of chemisorption as the heat supplied provides the activation energy for the process.
Question 3
1 / -0

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

Solution

Anhydrous calcium chloride is hygroscopic and absorbs moisture.
Question 4
1 / -0

Which zeolite is used by the petrochemical industry to catalyze the cracking of hydrocarbons?

A
Mordenite

B
Offretite

C
Ferrierite

D
ZSM-5

Solution

Factual
Question 5
1 / -0

The reactions involving zeolites as catalysts depend on

A
the shape of the substrate molecule

B
the size of the pores on the catalyst surface

C
Both (1) and (2)

D
the pH of the reaction mixture

Solution

Zeolites are shape specific catalysts.
Question 6
1 / -0

The following question has four choices out of which ONLY ONE is correct.

The adsorbent used to decolorize raw sugar is

A
alum

B
animal charcoal

C
powdered copper

D
ZnO

Solution

Animal charcoal adsorbs colored impurities.
Question 7
1 / -0

Which of the following catalysts is used for the decomposition of KClO₃?

A
MnO₂

B
Cl₂

C
V₂O₅

D
Pt

Solution

In this preparation, manganese dioxide (MnO₂) is often used. This compound is not used up in the reaction and can be shown to have the same composition as it had before the reaction occurred. The only effect it has is that it lowers the temperature needed to decompose KClO₃ and thus speeds up the reaction. Substances that behave in this manner are referred to as catalysts.
Question 8
1 / -0

Which of the following will have the least coagulating power for arsenious sulphide sol?

A
Na⁺

B
Ca²⁺

C
Al³⁺

D
Mg²⁺

Solution

Arsenious sulphide sol is a negatively charged sol. The smaller the charge on the positive ion, the lesser the coagulation power.

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Surface Chemistry Test - 3

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Surface Chemistry Test - 3

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Question 1

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.

Solution

Question 2

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.

Solution

Question 3

Anhydrous CaCl2

Silica

Same in both

Data insufficient

Solution

Question 4

Mordenite

Offretite

Ferrierite

ZSM-5

Solution

Question 5

the shape of the substrate molecule

the size of the pores on the catalyst surface

Both (1) and (2)

the pH of the reaction mixture

Solution

Question 6

alum

animal charcoal

powdered copper

ZnO

Solution

Question 7

MnO2

Cl2

V2O5

Pt

Solution

Question 8

Na+

Ca2+

Al3+

Mg2+

Solution

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Anhydrous CaCl₂

MnO₂

Cl₂

V₂O₅

Na⁺

Ca²⁺

Al³⁺

Mg²⁺