Surface Chemistry Test

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Surface Chemistry Test - 3

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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
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
Question 4
1 / -0

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
1 / -0

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 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 9
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 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
Question 11
1 / -0

Which of the following statements is true?

A
Catalyst is used to alter the values of K_p and K_c of an equilibrium reaction.

B
A large quantity of catalyst is needed for a reaction.

C
A catalyst alters the position of equilibrium in a reversible reaction.

D
A catalyst is specific in its action.
Question 12
1 / -0

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

Which of the following statements is not correct?

A
Adsorption energy for chemical adsorption is generally greater than that for physical adsorption.

B
Physical adsorption is due to van der Waals forces.

C
Physical adsorption decreases at high temperature.

D
Physical adsorption is an irreversible reaction.
Question 13
1 / -0

Which of the following is/are correct according to the given adsorption isotherm?

A

B

C

D
All of the above
Question 14
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
Question 15
1 / -0

Emulsions are colloids formed by immiscible liquids and are stabilized by adding a stabilizer. Insoluble soap acts as a stabilizer because

A
it is an electrolyte

B
it has a hydrophilic end and a hydrophobic end

C
of the cleansing action of soap

D
of the formation of soap micelle
Question 16
1 / -0

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

A
Na⁺

B
Ca²⁺

C
Al³⁺

D
Mg²⁺
Question 17
1 / -0

Which of the following factors are responsible for an increase in the rate of a surface-catalysed reaction?

1. A catalyst provides proper orientation for the reactant molecules to react.
2. Heat of adsorption of the reactants on a catalyst helps the reactant molecules to attain the required activation energy.
3. The catalyst increases the activation energy of the reaction.
4. Adsorption increases the local concentration of reactant molecules on the surface of the catalyst.

A
1 and 2

B
1 and 3

C
2 and 4

D
1, 2 and 3

E
All of these
Question 18
1 / -0

The autocatalyst used in the oxidation of oxalic acid by acidified KMnO₄ is

A
K₂SO₄

B
KMnO₄

C
MnSO₄

D
CO₂
Question 19
1 / -0

Which of the following acts as a catalytic poison in Haber's process?

A
Platinum

B
Iron

C
Molybdenum

D
Sulphur
Question 20
1 / -0

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

A
Desorption

B
Physisorption

C
Sorption

D
Chemisorptions

Solution

Both adsorption and absorption can take place simultaneously also. The term sorption is used to describe both the processes.
Question 21
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
Question 22
1 / -0

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

A
MnO₂

B
Cl₂

C
V₂O₅

D
Pt
Question 23
1 / -0

Column chromatography is based on the principle of

A
selective absorption

B
selective adsorption

C
differential absorption

D
differential adsorption
Question 24
1 / -0

Directions: 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
Question 25
1 / -0

Which of the following substances is not used for preparing lyophilic sols?

A
Starch

B
Gum

C
Gelatin

D
Metal sulphide

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Surface Chemistry Test - 3

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Surface Chemistry Test - 3

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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 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 9

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 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

Question 11

Catalyst is used to alter the values of Kp and Kc of an equilibrium reaction.

A large quantity of catalyst is needed for a reaction.

A catalyst alters the position of equilibrium in a reversible reaction.

A catalyst is specific in its action.

Question 12

Adsorption energy for chemical adsorption is generally greater than that for physical adsorption.

Physical adsorption is due to van der Waals forces.

Physical adsorption decreases at high temperature.

Physical adsorption is an irreversible reaction.

Question 13

All of the above

Question 14

Mordenite

Offretite

Ferrierite

ZSM-5

Question 15

Anhydrous CaCl₂

BaCl₂

CaCl₂

FeCl₃

Anhydrous CaCl₂

TiCl₄ + trialkylaluminium

Pd + BaSO₄

Catalyst is used to alter the values of K_p and K_c of an equilibrium reaction.

Na⁺

Ca²⁺

Al³⁺

Mg²⁺

K₂SO₄

KMnO₄

MnSO₄

CO₂

MnO₂

Cl₂

V₂O₅