Chemical Kinetics Test

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Chemical Kinetics Test - 4

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Question 1

1 / -0

Match the order of the reaction from column - I with the reaction characteristics from column - II in the following table.

Column - I	Column - II
(A) Zero-order reaction	(a) High activation energy
(B) Pseudo unimolecular reaction	(b) Decreases activation energy
(C) Slow reaction	(c) Decomposition of ammonia on tungsten
(D) Positive catalyst	(d) Hydrolysis of cane sugar

(A) - (c), (B) - (d), (C) - (a), (D) - (b)

(A) - (d), (B) - (a), (C) - (c), (D) - (b)

(A) - (c), (B) - (b), (C) - (a), (D) - (d)

(A) - (a), (B) - (d), (C) - (c), (D) - (b)

Solution

(A) Decomposition of ammonia on tungsten is a zero-order reaction.
So, (A) - (c).
(B) Hydrolysis of cane sugar is a pseudo unimolecular reaction.
Thus, (B) - (d).
(C) A slow reaction has a high activation energy.
So, (C) - (a).
(D) A positive catalyst increases the speed of a reaction by lowering the activation energy for the process.
Thus, (D) - (b).

Question 2
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The inversion of cane sugar is represented by C₁₂H₂₂O₁₁ + H₂O → C₆H₁₂O₆ + C₆H₁₂O₆. This reaction is a

A
second-order reaction

B
unimolecular reaction

C
pseudo-unimolecular reaction

D
None of these

Solution

This option is correct because this reaction is not truly unimolecular.
Question 3
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The temperature coefficient of a reaction is

A
the rate constant at a fixed temperature

B
the ratio of the rate constants at two different temperatures

C
the ratio of the rate constants at temperatures differing by at least 25^oC

D
the ratio of the rate constants at temperatures differing by 10^oC (say from 25^oC to 35^oC)

Solution

The temperature coefficient of a reaction is the ratio of the rate constants at temperatures differing by 10^oC (say from 25^oC to 35^oC).
Question 4
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A catalyst is a substance which

A
increases the equilibrium concentrations of the products

B
decreases the energy of activation

C
does not alter reaction mechanism

D
increases the frequency of collision of reacting species

Solution

Catalyst is a chemical substance which does not effect the equilibrium and decreases the activation energy of a chemical reaction, which leads to an increase in the rate of the chemical reaction.
Question 5
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A catalyst is added to a reaction to increase the rate of reaction. Which of the following statements is correct?

A
A catalyst increases the activation energy between reactants and products and hence, lowers the potential energy barrier.

B
A catalyst provides an alternate pathway or reaction mechanism.

C
A catalyst alters ΔG, Gibbs energy of reaction.

D
A catalyst changes the equilibrium constant of a reaction.

Solution

This is correct as a catalyst provides an alternate pathway or reaction mechanism.
Question 6
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The activation energy in a chemical reaction is defined as

A
the difference in energies of reactants and products

B
the sum of energies of reactants and products

C
the difference in energies of intermediate complexes with the average energy of reactants and products

D
the difference in energies of intermediate complexes and the average energy of reactants

Solution

Activation energy is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation or physical transport. In transition state theory, the activation energy is the difference in energy content between atoms or molecules in an activated or transition state configuration and the corresponding atoms and molecules in their initial configuration.

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Chemical Kinetics Test - 4

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Chemical Kinetics Test - 4

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Question 1

(A) - (c), (B) - (d), (C) - (a), (D) - (b)

(A) - (d), (B) - (a), (C) - (c), (D) - (b)

(A) - (c), (B) - (b), (C) - (a), (D) - (d)

(A) - (a), (B) - (d), (C) - (c), (D) - (b)

Solution

Question 2

second-order reaction

unimolecular reaction

pseudo-unimolecular reaction

None of these

Solution

Question 3

the rate constant at a fixed temperature

the ratio of the rate constants at two different temperatures

the ratio of the rate constants at temperatures differing by at least 25oC

the ratio of the rate constants at temperatures differing by 10oC (say from 25oC to 35oC)

Solution

Question 4

increases the equilibrium concentrations of the products

decreases the energy of activation

does not alter reaction mechanism

increases the frequency of collision of reacting species

Solution

Question 5

A catalyst increases the activation energy between reactants and products and hence, lowers the potential energy barrier.

A catalyst provides an alternate pathway or reaction mechanism.

A catalyst alters ΔG, Gibbs energy of reaction.

A catalyst changes the equilibrium constant of a reaction.

Solution

Question 6

the difference in energies of reactants and products

the sum of energies of reactants and products

the difference in energies of intermediate complexes with the average energy of reactants and products

the difference in energies of intermediate complexes and the average energy of reactants

Solution

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the ratio of the rate constants at temperatures differing by at least 25^oC

the ratio of the rate constants at temperatures differing by 10^oC (say from 25^oC to 35^oC)