Surface Chemistry Test

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Surface Chemistry Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

When gases are brought in contact with solid adsorbents, in most cases

A
All option are corrected

B
the larger is the heat of condensation of the gas, greater would be its extent of adsorption

C
adsorption involves multi molecular layer formation

D
the amount of adsorption increases with the increase of the gas pressure

Solution

Accordance with Le-Chatelier’s principle, the increase of temperature should decrease the extent of adsorption.

The correct answer is: adsorption involves multi molecular layer formation, the amount of adsorption increases with the increase of the gas pressure, the larger is the heat of condensation of the gas, greater would be its extent of adsorption
Question 2
1 / -0

Which of the following statements is / are correct?

A
All correct.

B
Syneresis can take place in the ageing of unstable gels.

C
Syneresis depends upon the temperature and presence of the electrolyte in the Jelly.

D
On mixing a positively charged ferric hydroxide sol and negatively charged arsenious sulphide sol, syneresis occurs.

Solution

All the given statements are correct.

The correct answer is: Syneresis is a phenomenon of exclusion of the liquid constituent of gels on standing, whereby gel contracts or shrinks., Syneresis can take place in the ageing of

unstable gels., Syneresis depends upon the temperature and presence of the

electrolyte in the Jelly., On mixing a positively charged ferric hydroxide sol and negatively charged arsenious sulphide sol, syneresis occurs.
Question 3
1 / -0

Which of the following compounds can form micelles in aqueous solution?

A
Both B and D

B
Sodium alkyl benzene sulphonate

C
Sodium benzoate

D
CH₃ (CH₂)₁₅ N(CH₃)₃ Br

Solution

The correct answer is: Sodium palmitate, Sodium alkyl benzene sulphonate, CH₃ (CH₂)₁₅ N(CH₃)₃ Br
Question 4
1 / -0

Select the true statements of the following

A
Both C and D

B
Carbon monoxide is physically adsorbed by wood charcoal.

C
Ammonia is absorbed by water but adsorbed by charcoal

D
Water vapour is absorbed by concentrated sulphuric acid but adsorbed by silica gel

Solution

Water vapour is absorbed by CaCl₂ and carbon monoxide is

chemisorbed on wood charcoal.

The correct answer is: Ammonia is absorbed by water but adsorbed by charcoal, Water vapour is absorbed by concentrated sulphuric acid but adsorbed
by silica gel
Question 5
1 / -0

Statement - 1: Fluorescein and eosin are used as adsorption indicators and these are used as sodium salts.

Statement - 2: Basic dye stuffs such as those of rhodamine series are used as adsorption indicators and these are used as sodium salts.

A
Both Statement – 1 and Statement – 2 are true and Statement – 2 is the correct explanation of Statement – 1.

B
Both Statement – 1 and Statement – 2 are true and Statement – 2 is not the correct explanation of Statement – 1.

C
Statement – 1 is true but Statement – 2 is false.

D
Statement – 1 is false but Statement – 2 is true.

Solution

Your answer is incorrect.

Assertion is true, reason is false.

Basic dye stuffs as those of rhodamine series are used as adsorption indicators and are generally used as halogen salts.

The correct answer is: Statement – 1 is true but Statement – 2 is false.
Question 6
1 / -0

Statement - 1: Permanent gases such as H_2, N₂, O₂etc. are adsorbed to a lesser extent and less readily than the more easily liquefiable gases such as NH₃, HCl, Cl₂ etc.

Statement - 2: Molecules of liquefiable gases have greater van der waals or molecular forces of attraction.

A
Both Statement – 1 and Statement – 2 are true and Statement – 2 is the correct explanation of Statement – 1.

B
Both Statement – 1 and Statement – 2 are true and Statement – 2 is not the correct explanation of Statement – 1.

C
Statement – 1 is true but Statement – 2 is false.

D
Statement – 1 is false but Statement – 2 is true.

Solution

Both assertion and reason are true and reason is the correct explanation of assertion.

The correct answer is: Both Statement – 1 and Statement – 2 are true and Statement – 2 is the correct explanation of Statement – 1.
Question 7
1 / -0

Process could be _________. If a gas interacts with a solid surface quite strongly.

A
endothermic

B
reversible

C
specific

D
nonspecific

Solution

The process would be chemisorption which is highly specific.

The correct answer is: specific
Question 8
1 / -0

Which of the following statements is wrong?

A
The magnitude of chemisorption increases and that of physisorption decreases with rise in temperature.

B
Physisorption takes place with decrease of free energy whereas the chemisorption occurs with increase of free energy

C
Both physisorption and chemisorptions are exothermic

D
Physisorption requires low activation energy but the chemisorption requires high activation energy

Solution

ΔG for both physic and chemisorption is negative.

The correct answer is: Physisorption takes place with decrease of free energy whereas the chemisorption occurs with increase of free energy

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Surface Chemistry Test - 4

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Surface Chemistry Test - 4

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Question 1

All option are corrected

the larger is the heat of condensation of the gas, greater would be its extent of adsorption

adsorption involves multi molecular layer formation

the amount of adsorption increases with the increase of the gas pressure

Solution

Question 2

All correct.

Syneresis can take place in the ageing of unstable gels.

Syneresis depends upon the temperature and presence of the electrolyte in the Jelly.

On mixing a positively charged ferric hydroxide sol and negatively charged arsenious sulphide sol, syneresis occurs.

Solution

Question 3

Both B and D

Sodium alkyl benzene sulphonate

Sodium benzoate

CH3 (CH2)15 N(CH3)3 Br

Solution

Question 4

Both C and D

Carbon monoxide is physically adsorbed by wood charcoal.

Ammonia is absorbed by water but adsorbed by charcoal

Water vapour is absorbed by concentrated sulphuric acid but adsorbed by silica gel

Solution

Question 5

Both Statement – 1 and Statement – 2 are true and Statement – 2 is the correct explanation of Statement – 1.

Both Statement – 1 and Statement – 2 are true and Statement – 2 is not the correct explanation of Statement – 1.

Statement – 1 is true but Statement – 2 is false.

Statement – 1 is false but Statement – 2 is true.

Solution

Question 6

Both Statement – 1 and Statement – 2 are true and Statement – 2 is the correct explanation of Statement – 1.

Both Statement – 1 and Statement – 2 are true and Statement – 2 is not the correct explanation of Statement – 1.

Statement – 1 is true but Statement – 2 is false.

Statement – 1 is false but Statement – 2 is true.

Solution

Question 7

endothermic

reversible

specific

nonspecific

Solution

Question 8

The magnitude of chemisorption increases and that of physisorption decreases with rise in temperature.

Physisorption takes place with decrease of free energy whereas the chemisorption occurs with increase of free energy

Both physisorption and chemisorptions are exothermic

Physisorption requires low activation energy but the chemisorption requires high activation energy

Solution

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CH₃ (CH₂)₁₅ N(CH₃)₃ Br