Surface Chemistry Test

Result

Surface Chemistry Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Adsorption is always

A
Endothermic

B
Exothermic

C
Either (a) or (b)

D
None of these

Solution

Adsorption is an exothermic process.
Question 2
1 / -0

Which of the following kinds of catalysis can be explained by the adsorption theory ?

A
Homogeneous catalysis

B
Acid base catalysis

C
Heterogeneous catalysis

D
Enzyme catalysis

Solution

Heterogeneous catalysis can be explained by the adsorption theory.
Question 3
1 / -0

Adsorption due to strong chemical forces is called

A
Chemisorption

B
Physiosorption

C
Reversible adsorption

D
Both (b) and (c)

Solution

Adsorption due to strong chemical bond is called chemical adsorption or chemisorption or Langmuir adsorption.
Question 4
1 / -0

Physical adsorption is inversely proportional to the

A
Volume

B
Concentration

C
Temperature

D
All of these

Solution

Physical adsorption decreases with increase of temperature.
Question 5
1 / -0

Noble gases are adsorbed by

A
Anhydrous calcium chloride

B
Ferric hydroxide

C
Conc. H₂SO₄

D
Activated coconut charcol

Solution

Noble gases are adsorbed by coconut charcoal. The adsorption of different noble gases occur at different temperatures, hence charcoal is used to separate these gases. Helium is not adsorbed by charcoal (as it is very difficulty liquifiable gas).
Question 6
1 / -0

Animal charcoal is used in decolourising colour of liquids because it is a good

A
Adsorbate

B
Adsorbent

C
Oxidising agent

D
Reducing agent

Solution

Animal charcoal is a good adsorbate. The impurities adsorbs on its surface and thus it decolourises colour of liquids.
Question 7
1 / -0

What will be the effect of increase in temperature on physical adsorption

A
It will decrease

B
It will increase

C
First increase then decrease

D
None of these

Solution

Since adsorption is an exothermic process (taking place with the evolution of heat) therefore in accordance with Lechatelier's principle, the magnitude of physical adsorption will decrease with the increase in temperature. In case of chemisorption the adsorption first increase and then decreases with increase in temperature.
Question 8
1 / -0

0.2 gm of fine animal charcoal is mixed with half litre of acetic acid solution and shaken for 30 minutes

A
Concentration remains same

B
Concentration increases

C
Concentration of the solution decrease

D
None of these

Solution

Concentration of the solution decreases because acetic acid gets adsorbed on charcoal.

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Surface Chemistry Test - 2

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Surface Chemistry Test - 2

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Question 1

Endothermic

Exothermic

Either (a) or (b)

None of these

Solution

Question 2

Homogeneous catalysis

Acid base catalysis

Heterogeneous catalysis

Enzyme catalysis

Solution

Question 3

Chemisorption

Physiosorption

Reversible adsorption

Both (b) and (c)

Solution

Question 4

Volume

Concentration

Temperature

All of these

Solution

Question 5

Anhydrous calcium chloride

Ferric hydroxide

Conc. H2SO4

Activated coconut charcol

Solution

Question 6

Adsorbate

Adsorbent

Oxidising agent

Reducing agent

Solution

Question 7

It will decrease

It will increase

First increase then decrease

None of these

Solution

Question 8

Concentration remains same

Concentration increases

Concentration of the solution decrease

None of these

Solution

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Conc. H₂SO₄