Surface Chemistry Test

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Surface Chemistry Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

In the oxidation of CH₄ to form CH₃OH in the presence of ZnO as a catalyst, molybdenum is used as a promoter.

The role of a promoter is

A
to form an activated complex

B
to decrease the activation energy for the reaction

C
to increase the rate of the reaction

D
to increase the efficiency of the catalyst

Solution

Promoters either increase the roughness of the catalyst surface and hence, the surface area for adsorption, or increase the free valencies and facilitate the formation of an activated complex.
Question 2
1 / -0

Methanol is converted to gasoline of high octane number, using zeolites. The intermediate formed in the process is

A
carbene

B
methyl free radical

C
carbocation

D
carbanion

Solution

The carbene units formed unite to form a mixture of hydrocarbons.
Question 3
1 / -0

Enzymes are biocatalysts that catalyze the life processes. They are basically polymers of

A
glucose

B
fructose and glucose

C
amino acids

D
methanol

Solution

Enzymes are proteins produced within the body.
Question 4
1 / -0

In the Bredig's arc method for the preparation of gold sol, which of the following is added as a stabiliser?

A
HCl

B
Gelatin

C
K₂CO₃

D
NaCl

Solution

The alkaline medium causes the polymerisation of gold hydroxide to create particles of colloidal size. Hence, K₂CO₃ is added as a stabiliser in the Bredig's arc method for the preparation of gold sol.
Question 5
1 / -0

The process of protecting a lyophobic sol by peptisation is based on the principle of

A
increasing the solvation of ions

B
selective adsorption of the common ion

C
stabilising by addition of a lyophilic colloid

D
increasing the mobility of the colloidal particles by dilution

Solution

The precipitate formed selectively adsorbs on its surface the common ion present in its lattice, thereby preventing the coagulation of the sol due to repulsions between the colloidal particles.
Question 6
1 / -0

Electrodialysis speeds up the process of dialysis by

A
preventing the colloidal particles from passing through the membrane

B
preventing the ions from passing through the membrane

C
increasing the rate of diffusion of the ions through the membrane

D
decreasing the rate of diffusion of the ions

Solution

The ions move faster under the effect of the electric current.
Question 7
1 / -0

The colloidal nature of a mixture cannot be preserved by

A
dialysis

B
electrophoresis

C
peptization

D
addition of a protective colloid layer

Solution

Electrophoresis will destroy the colloid by coagulation of the ions at the respective electrodes.
Question 8
1 / -0

As₂S₃ is a

A
positively charged sol

B
negatively charged sol

C
neutral lyophyilic sol

D
macromolecular colloid

Solution

As₂S₃ sol is a lyophobic sol stabilized by selective adsorption of S^2- ions from the excess of H₂S passed during its preparation.

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Surface Chemistry Test - 8

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Question 1

to form an activated complex

to decrease the activation energy for the reaction

to increase the rate of the reaction

to increase the efficiency of the catalyst

Solution

Question 2

carbene

methyl free radical

carbocation

carbanion

Solution

Question 3

glucose

fructose and glucose

amino acids

methanol

Solution

Question 4

HCl

Gelatin

K2CO3

NaCl

Solution

Question 5

increasing the solvation of ions

selective adsorption of the common ion

stabilising by addition of a lyophilic colloid

increasing the mobility of the colloidal particles by dilution

Solution

Question 6

preventing the colloidal particles from passing through the membrane

preventing the ions from passing through the membrane

increasing the rate of diffusion of the ions through the membrane

decreasing the rate of diffusion of the ions

Solution

Question 7

dialysis

electrophoresis

peptization

addition of a protective colloid layer

Solution

Question 8

positively charged sol

negatively charged sol

neutral lyophyilic sol

macromolecular colloid

Solution

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K₂CO₃