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CHXII05:SURFACE CHEMISTRY

320939 Role of desorption in the process of catalysis

1 The surface is not available for the reaction to occur.

2 Making the surface available again for more reaction to occur.

3 Half of the surface is available for the reaction to occur.

4 All of these

CHXII05:SURFACE CHEMISTRY

320940 Arrange the following diagrams in correct sequence of steps involved in the mechanism of catalyst, in accordance with modern adsorption theory.
supporting img

1

I \to III \to II \to IV \to V

2

I \to II \to III \to V \to IV

3

I \to II \to III \to IV \to V

4

I \to III \to II \to V \to I V

Explanation:

Correct sequence is I $\to$ III $\to$ II $\to$ $IV \to V$
Each transformation denotes a meaningful process as follows: $I \to$ adsorption of $A$ and $B$ on surface
III $\to$ II interaction between A and B to form intermediate
II $\to$ IV starting desorption of $AB$
$IV \to V$ complete desorption
supporting img

NCERT Exemplar

CHXII05:SURFACE CHEMISTRY

320941 Intermediate compound theory is the mechanism of

1 Positive catalysis

2 Negative catalysis

3 Homogeneous catalysis

4 Heterogeneous catalysis

CHXII05:SURFACE CHEMISTRY

320942 According to adsorption theory of catalysis, the incorrect statement is

1 In the process of adsorption, the activation energy of the molecules is large

2 Adsorption produces heat which increases the speed of reaction

3 Adsorption lowers the activation energy of the reaction

4 All are incorrect

CHXII05:SURFACE CHEMISTRY

320943 According to adsorption theory of catalysis, the reaction rate increases, because

1 Adsorption produces heat which increases the rate of reaction

2 In the process of adsorption, the kinetic energy of the molecules increases

3 The concentration of reactants at the active centers becomes high due to adsorption

4 The activation energy of the reaction becomes high due to adsorption

CHXII05:SURFACE CHEMISTRY

320939 Role of desorption in the process of catalysis

1 The surface is not available for the reaction to occur.

2 Making the surface available again for more reaction to occur.

3 Half of the surface is available for the reaction to occur.

4 All of these

CHXII05:SURFACE CHEMISTRY

320940 Arrange the following diagrams in correct sequence of steps involved in the mechanism of catalyst, in accordance with modern adsorption theory.
supporting img

1

I \to III \to II \to IV \to V

2

I \to II \to III \to V \to IV

3

I \to II \to III \to IV \to V

4

I \to III \to II \to V \to I V

Explanation:

Correct sequence is I $\to$ III $\to$ II $\to$ $IV \to V$
Each transformation denotes a meaningful process as follows: $I \to$ adsorption of $A$ and $B$ on surface
III $\to$ II interaction between A and B to form intermediate
II $\to$ IV starting desorption of $AB$
$IV \to V$ complete desorption
supporting img

NCERT Exemplar

CHXII05:SURFACE CHEMISTRY

320941 Intermediate compound theory is the mechanism of

1 Positive catalysis

2 Negative catalysis

3 Homogeneous catalysis

4 Heterogeneous catalysis

CHXII05:SURFACE CHEMISTRY

320942 According to adsorption theory of catalysis, the incorrect statement is

1 In the process of adsorption, the activation energy of the molecules is large

2 Adsorption produces heat which increases the speed of reaction

3 Adsorption lowers the activation energy of the reaction

4 All are incorrect

CHXII05:SURFACE CHEMISTRY

320943 According to adsorption theory of catalysis, the reaction rate increases, because

1 Adsorption produces heat which increases the rate of reaction

2 In the process of adsorption, the kinetic energy of the molecules increases

3 The concentration of reactants at the active centers becomes high due to adsorption

4 The activation energy of the reaction becomes high due to adsorption

CHXII05:SURFACE CHEMISTRY

320939 Role of desorption in the process of catalysis

1 The surface is not available for the reaction to occur.

2 Making the surface available again for more reaction to occur.

3 Half of the surface is available for the reaction to occur.

4 All of these

CHXII05:SURFACE CHEMISTRY

320940 Arrange the following diagrams in correct sequence of steps involved in the mechanism of catalyst, in accordance with modern adsorption theory.
supporting img

1

I \to III \to II \to IV \to V

2

I \to II \to III \to V \to IV

3

I \to II \to III \to IV \to V

4

I \to III \to II \to V \to I V

Explanation:

Correct sequence is I $\to$ III $\to$ II $\to$ $IV \to V$
Each transformation denotes a meaningful process as follows: $I \to$ adsorption of $A$ and $B$ on surface
III $\to$ II interaction between A and B to form intermediate
II $\to$ IV starting desorption of $AB$
$IV \to V$ complete desorption
supporting img

NCERT Exemplar

CHXII05:SURFACE CHEMISTRY

320941 Intermediate compound theory is the mechanism of

1 Positive catalysis

2 Negative catalysis

3 Homogeneous catalysis

4 Heterogeneous catalysis

CHXII05:SURFACE CHEMISTRY

320942 According to adsorption theory of catalysis, the incorrect statement is

1 In the process of adsorption, the activation energy of the molecules is large

2 Adsorption produces heat which increases the speed of reaction

3 Adsorption lowers the activation energy of the reaction

4 All are incorrect

CHXII05:SURFACE CHEMISTRY

320943 According to adsorption theory of catalysis, the reaction rate increases, because

1 Adsorption produces heat which increases the rate of reaction

2 In the process of adsorption, the kinetic energy of the molecules increases

3 The concentration of reactants at the active centers becomes high due to adsorption

4 The activation energy of the reaction becomes high due to adsorption

CHXII05:SURFACE CHEMISTRY

320939 Role of desorption in the process of catalysis

1 The surface is not available for the reaction to occur.

2 Making the surface available again for more reaction to occur.

3 Half of the surface is available for the reaction to occur.

4 All of these

CHXII05:SURFACE CHEMISTRY

320940 Arrange the following diagrams in correct sequence of steps involved in the mechanism of catalyst, in accordance with modern adsorption theory.
supporting img

1

I \to III \to II \to IV \to V

2

I \to II \to III \to V \to IV

3

I \to II \to III \to IV \to V

4

I \to III \to II \to V \to I V

Explanation:

Correct sequence is I $\to$ III $\to$ II $\to$ $IV \to V$
Each transformation denotes a meaningful process as follows: $I \to$ adsorption of $A$ and $B$ on surface
III $\to$ II interaction between A and B to form intermediate
II $\to$ IV starting desorption of $AB$
$IV \to V$ complete desorption
supporting img

NCERT Exemplar

CHXII05:SURFACE CHEMISTRY

320941 Intermediate compound theory is the mechanism of

1 Positive catalysis

2 Negative catalysis

3 Homogeneous catalysis

4 Heterogeneous catalysis

CHXII05:SURFACE CHEMISTRY

320942 According to adsorption theory of catalysis, the incorrect statement is

1 In the process of adsorption, the activation energy of the molecules is large

2 Adsorption produces heat which increases the speed of reaction

3 Adsorption lowers the activation energy of the reaction

4 All are incorrect

CHXII05:SURFACE CHEMISTRY

320943 According to adsorption theory of catalysis, the reaction rate increases, because

1 Adsorption produces heat which increases the rate of reaction

2 In the process of adsorption, the kinetic energy of the molecules increases

3 The concentration of reactants at the active centers becomes high due to adsorption

4 The activation energy of the reaction becomes high due to adsorption

CHXII05:SURFACE CHEMISTRY

320939 Role of desorption in the process of catalysis

1 The surface is not available for the reaction to occur.

2 Making the surface available again for more reaction to occur.

3 Half of the surface is available for the reaction to occur.

4 All of these

CHXII05:SURFACE CHEMISTRY

320940 Arrange the following diagrams in correct sequence of steps involved in the mechanism of catalyst, in accordance with modern adsorption theory.
supporting img

1

I \to III \to II \to IV \to V

2

I \to II \to III \to V \to IV

3

I \to II \to III \to IV \to V

4

I \to III \to II \to V \to I V

Explanation:

Correct sequence is I $\to$ III $\to$ II $\to$ $IV \to V$
Each transformation denotes a meaningful process as follows: $I \to$ adsorption of $A$ and $B$ on surface
III $\to$ II interaction between A and B to form intermediate
II $\to$ IV starting desorption of $AB$
$IV \to V$ complete desorption
supporting img

NCERT Exemplar

CHXII05:SURFACE CHEMISTRY

320941 Intermediate compound theory is the mechanism of

1 Positive catalysis

2 Negative catalysis

3 Homogeneous catalysis

4 Heterogeneous catalysis

CHXII05:SURFACE CHEMISTRY

320942 According to adsorption theory of catalysis, the incorrect statement is

1 In the process of adsorption, the activation energy of the molecules is large

2 Adsorption produces heat which increases the speed of reaction

3 Adsorption lowers the activation energy of the reaction

4 All are incorrect

CHXII05:SURFACE CHEMISTRY

320943 According to adsorption theory of catalysis, the reaction rate increases, because

1 Adsorption produces heat which increases the rate of reaction

2 In the process of adsorption, the kinetic energy of the molecules increases

3 The concentration of reactants at the active centers becomes high due to adsorption

4 The activation energy of the reaction becomes high due to adsorption

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