Surface Chemistry Test

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Surface Chemistry Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Heating a piece of charcoal will facilitate which of the following processes?

A
Absorption

B
Evaporation

C
Adsorption

D
Desorption

Solution

As the adsorbent particles gain energy, they can overcome the forces that bind them to the surface of the adsorbate.
Question 2
1 / -0

Which of the following is not a characteristic of chemisorption?

A
Irreversible nature

B
Specificity

C
Formation of a multilayer

D
Initial increase in the extent of adsorption with the increase in temperature

Solution

Formation of a multilayer is a characteristic of physisorption.
Question 3
1 / -0

The dispersed phase in colloidal iron (III) hydroxide and that in colloidal gold are positively and negatively charged, respectively. Which of the following statements is not correct?

A
Magnesium chloride solution coagulates the gold solution more readily than the iron (III) hydroxide solution.

B
Sodium sulphate solution causes coagulation in both solutions.

C
Mixing the solutions has no effect.

D
Coagulation in both solutions can be brought about by electrophoresis.

Solution

By mixing oppositely charged lyophobic colloids, mutual coagulation of the two solutions takes place.
Question 4
1 / -0

Solution A is 0.2 M acetic acid and solution B is 0.5 M acetic acid. If 1 g of charcoal is added to both the solutions, then the extent of adsorption is

A
more in A

B
more in B

C
same in both

D
negligible in both

Solution

The extent of adsorption increases with increase in the concentration of the adsorbate.
Question 5
1 / -0

When a 2 g piece of charcoal is added to a 0.25 M CH₃COOH solution, the concentration drops to 0.23 M. The extent of adsorption is

A
0.6

B
1.8

C
2.5

D
4.9

Solution

Number of moles of CH₃COOH adsorbed = 0.25 – 0.23 = 0.02
Mass of CH₃COOH adsorbed = 0.02 × 60 = 1.2 g
x/m = 1.2/2 = 0.6
Question 6
1 / -0

When an excess of a very dilute aqueous solution of KI is added to a very dilute solution of silver nitrate, the colloidal particles of silver iodide which are associated with Helmholtz double layer are

A
AgI : Ag⁺ : I^-

B
AgI : K⁺ : NO₃^-

C
AgI : NO₃^- : Ag⁺

D
AgI : I^- : K⁺

Solution

On adding KI to AgNO₃, AgI is formed. Since KI is added in excess, the AgI formed adsorbs on its surface the I^- ions preferably as it is also present in its lattice.
The negatively charged sol particles adsorb K⁺ ions from the solution which forms the Helmholtz electrical double layer.
Question 7
1 / -0

Cottrell precipitator is installed in chimneys because

A
it helps in the faster diffusion of the exhaust fumes

B
it helps in the coagulation of carbon particles from smoke

C
it neutralizes the oxides of sulphur and nitrogen from the smoke

D
it helps to settle the dirt particles

Solution

The Cottrell precipitator precipitates the carbon particles from the smoke and helps to reduce the air pollution.
Question 8
1 / -0

Homogeneous catalysis proceeds through the formation of

A
an activated complex

B
an intermediate

C
a more stable product

D
a less stable product

Solution

During homogeneous catalysis, the reactions proceeds through a new pathway that requires lesser activation energy.
The reaction proceeds through the formation of an intermediate which is more stable than the one formed without the catalyst and hence requires lesser activation energy.

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Re-Attempt Weekly Quiz Competition

Surface Chemistry Test - 7

Result

Surface Chemistry Test - 7

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SHARING IS CARING

Question 1

Absorption

Evaporation

Adsorption

Desorption

Solution

Question 2

Irreversible nature

Specificity

Formation of a multilayer

Initial increase in the extent of adsorption with the increase in temperature

Solution

Question 3

Magnesium chloride solution coagulates the gold solution more readily than the iron (III) hydroxide solution.

Sodium sulphate solution causes coagulation in both solutions.

Mixing the solutions has no effect.

Coagulation in both solutions can be brought about by electrophoresis.

Solution

Question 4

more in A

more in B

same in both

negligible in both

Solution

Question 5

0.6

1.8

2.5

4.9

Solution

Question 6

AgI : Ag+ : I-

AgI : K+ : NO3-

AgI : NO3- : Ag+

AgI : I- : K+

Solution

Question 7

it helps in the faster diffusion of the exhaust fumes

it helps in the coagulation of carbon particles from smoke

it neutralizes the oxides of sulphur and nitrogen from the smoke

it helps to settle the dirt particles

Solution

Question 8

an activated complex

an intermediate

a more stable product

a less stable product

Solution

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AgI : Ag⁺ : I^-

AgI : K⁺ : NO₃^-

AgI : NO₃^- : Ag⁺

AgI : I^- : K⁺