Surface Chemistry Test

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Surface Chemistry Test - 1

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following statements is correct about solid catalysts?

A
Catalyst is required in equal amount as the reactants present in the reaction

B
Catalytic activity of a solid catalyst does not depend upon the extent of chemisorption

C
Desorption is not important for a solid to act as good catalyst

D
Same reactants may give different products by using different catalysts

Solution

A catalyst is specific in nature. Same reactant can give different products with different catalysts.
Question 2
4 / -1

Which of the following can adsorb larger volume of hydrogen gas?

A
Finely divided platinum

B
Colloidal solution of palladium

C
Small pieces of palladium

D
A single metal surface of platinum

Solution

In colloidal solution the particles are suspended and are more dispersed than powdered form hence adsorption is maximum.
Question 3
4 / -1

Traces of molybdenum are used with finely divided iron which acts as a catalyst during Haber’s process for synthesis of ammonia. The molybdenum

A
Acts as a promoter to increase the activity of the catalyst

B
Acts as a poison to decrease the activity of the catalyst

C
Provides a new pathway to the reaction

D
Forms another intermediate compound with lesser activation energy

Solution

Substances which themselves are not catalysts but when mixed in small quantities with the catalysts increase their efficiency are called promoters or activators.
Question 4
4 / -1

Which kind of catalysis can be explained on the basis of adsorption theory?

A
Homogeneous catalysis

B
Heterogeneous catalysis

C
Negative catalysis

D
Auto catalysis

Solution

Heterogeneous catalysis can be explained on the basis of adsorption theory.
Question 5
4 / -1

According to adsorption theory of catalysis, the rate of reaction increases with the use of a catalyst because

A
The heat liberated during adsorption increases the rate of reaction

B
The kinetic energy of reactants increases which increases the rate of reaction

C
The activation energy of reaction increases which increases the rate of reaction

D
The concentration of reactants at the active centres becomes high due to adsorption resulting in increase in the rate of reaction

Solution

Due to adsorption the concentration of reactants increases at active centres due to which rate of reaction increases.
Question 6
4 / -1

The oxide of nitrogen which acts as a catalyst in lead chamber process is

A
NO

B
NO₂

C
N₂O₄

D
N₂O₅

Solution
Question 7
4 / -1

Which of the following is an example of heterogeneous catalysis?

A

B

C

D

Solution

This is an example of heterogeneous catalysis as the catalyst is present in different phase than that of the reactants.

Following reactions are the examples of homogeneous catalysis as the catalyst and the reactants are in same phase.
Question 8
4 / -1

Shape-selective catalysis is a reaction catalysed by

A
Zeolites

B
Enzymes

C
Platinum

D
Ziegler-Natta catalyst

Solution

Zeolite is a most widely studied shape-selective catalyst. Shape-selectivity of zeolite depends upon pore structure of the catalyst, pore size generally varies between 260 pm to 740 pm. Such catalysts are highly specific because molecules of only a particular size and shape enter these pores and get adsorbed.
Question 9
4 / -1

Which of the following statements about zeolites is not correct?

A
Zeolites are open structures of silica in which trivalent aluminium is substituted by a fraction of silicon atoms

B
Shape selectivity of zeolites depends upon porous structure of the catalyst

C
Zeolites are synthetic microporous aluminosilicates which do not exist naturally

D
Zeolites are aluminosilicates haveing three dimensional network

Solution

Zeolites are naturally occurring or synthetic microporous aluminosilicates.
Question 10
4 / -1

The activity of an enzyme becomes ineffective

A
At low temperature

B
At atmospheric pressure

C
At high temperature

D
In aqueous medium

Solution

Enzymes are effective only at optimum temperature. They become ineffective at very high temperature.