Chemical Kinetics Test

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Chemical Kinetics Test - 81

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Weekly Quiz Competition

Question 1
1 / -0

The energy of activation for reaction $$(KJ/mol)$$ is :

A
20.83

B
13.83

C
15.23

D
10.23

Solution
Question 2
1 / -0

For a zero order reaction

A
The concentration of the reactant does not change during the reaction

B
The concentration change only when the temperature changes

C
The rate remains constant throughout

D
The rate of the reaction is proportional to the concentration

Solution

Rate of $$\textbf {zero order}$$ reaction is independent of the concentration of the reactant and remains constant throughout the reaction.
hence option (C) is correct.
Question 3
1 / -0

The rate constant is doubled when temperature increases from $$27^{o}C$$ to $$37^{o}C$$. Activation energy in $$kJ$$ is:

A
$$34$$

B
$$53.6$$

C
$$100$$

D
$$50$$

Solution

$$\log{\dfrac{K_2}{K_1}}=\dfrac{E_a}{2.303R}\left[\dfrac{1}{T_1}-\dfrac{1}{T_2}\right]$$

If $$\dfrac{K_2}{K_1}=2$$

$$\log{2}=\dfrac{E_a}{2.303\times8.314}\left[\dfrac{1}{300}-\dfrac{1}{310}\right]$$

$${E}_{a}$$ = $$.3010\times2.303\times8.314\left(\dfrac{300\times310}{10}\right)$$

= $$53598.59 J{mol}^{-1}$$

= $$53.6kJ$$
Question 4
1 / -0

A zero order reaction is one whose rate is independent of_________________________

A
Temperature of the reaction

B
The concentrations of the reactants

C
The concentration of the products

D
The material of the vessel in which the reaction is carried out

Solution

The rate of zero order reaction is not depend on the concentration of the reactants.

$$Rate = K[A]^0$$
Question 5
1 / -0

The energy of activation is

A
The energy associated with the activated molecules

B
Threshold energy energy of normal molecules

C
Threshold energy + energy of normal molecules

D
Energy of products energy of reactants

Solution

Activation energy is the energy needed by reactant molecules to gain threshold energy level.
Question 6
1 / -0

Activation energy is given by the formula

A
$$\log{\frac{K_2}{K_1}}=\frac{E_a}{2.303R}\left[\frac{{T_2}-{T_1}}{{T_1}{T_2}}\right]$$

B
$$\log{\frac{K_1}{K_2}}=-\frac{E_a}{2.303R}\left[\frac{{T_2}-{T_1}}{{T_1}{T_2}}\right]$$

C
$$\log{\frac{K_1}{K_2}}=-\frac{E_a}{2.303R}\left[\frac{{T}_{1}-{T_2}}{{T_1}{T_2}}\right]$$

D
None of these

Solution

$$log_eK_2 = log_eA - \cfrac{E_A}{RT_2}$$...........(1)

$$log_eK_1 = log_eA - \cfrac{E_A}{RT_1}$$..............(2)

Eqn. (1) - (2) we get,

$$\log{\cfrac{K_2}{K_1}}=\cfrac{E_a}{2.303R}\left[\cfrac{{T_2}-{T_1}}{{T_1}{T_2}}\right]$$

Option A is correct.
Question 7
1 / -0

Certain bimolecular reactions which follow the first order kinetics are called_________________________

A
First order reactions

B
Unimolecular reactions

C
Bimolecular reactions

D
Pseudounimolecular reactions

Solution

It is the characteristic of pseudo-unimolecular reactions.
Question 8
1 / -0

The $$\Delta H$$ value of the reaction $$H_2 + Cl_2 \rightleftharpoons 2HCl$$ is $$-44.12 \,kcal$$. If $$E_1$$ is the activation energy of the products, then for the above reaction

A
$$E_1 > E_2$$

B
$$E_1 < E_2$$

C
$$E_1 = E_2$$

D
$$\Delta H$$ is not related to $$E_1$$ and $$E_2$$

E
None is correct
Solution
$$\Delta {H} = E_2- E_1= Negative$$
$$E_1$$ is the activation energy of the products
$$E_2$$ is the activation energy of the reactants.

Thus , $$E_1>E_2$$

Option (A) is correct.
Question 9
1 / -0

Half-life period of a zero order reaction is:

A
Inversely proportional to the concentration

B
Independent of the concentration

C
Directly proportional to the initial concentration

D
Directly proportional to the final concentration

Solution

$$t_{1/2}$$ of zero-order reaction is independent of the concentration.

Hence, option B is correct.
Question 10
1 / -0

Assertion : Order of the reaction can be zero or fractional.
Reason : We cannot determine order from the balanced chemical equation.

A
Both assertion and reason are correct and the reason is correct explanation of assertion.

B
Both assertion and reason are correct but reason does not explain assertion.

C
Assertion is correct but reason is incorrect.

D
Both assertion and reason are incorrect.

E
Assertion is incorrect but reason is correct.

Solution

The assertion is correct as the order can be zero or fraction but it can be determined experimentally.

Hence, Option "B" is the correct answer.

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Re-Attempt Weekly Quiz Competition

Chemical Kinetics Test - 81

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Chemical Kinetics Test - 81

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SHARING IS CARING

Question 1

20.83

13.83

15.23

10.23

Solution

Question 2

The concentration of the reactant does not change during the reaction

The concentration change only when the temperature changes

The rate remains constant throughout

The rate of the reaction is proportional to the concentration

Solution

Question 3

$$34$$

$$53.6$$

$$100$$

$$50$$

Solution

Question 4

Temperature of the reaction

The concentrations of the reactants

The concentration of the products

The material of the vessel in which the reaction is carried out

Solution

Question 5

The energy associated with the activated molecules

Threshold energy energy of normal molecules

Threshold energy + energy of normal molecules

Energy of products energy of reactants

Solution

Question 6

$$\log{\frac{K_2}{K_1}}=\frac{E_a}{2.303R}\left[\frac{{T_2}-{T_1}}{{T_1}{T_2}}\right]$$

$$\log{\frac{K_1}{K_2}}=-\frac{E_a}{2.303R}\left[\frac{{T_2}-{T_1}}{{T_1}{T_2}}\right]$$

$$\log{\frac{K_1}{K_2}}=-\frac{E_a}{2.303R}\left[\frac{{T}_{1}-{T_2}}{{T_1}{T_2}}\right]$$

None of these

Solution

Question 7

First order reactions

Unimolecular reactions

Bimolecular reactions

Pseudounimolecular reactions

Solution

Question 8

$$E_1 > E_2$$

$$E_1 < E_2$$

$$E_1 = E_2$$

$$\Delta H$$ is not related to $$E_1$$ and $$E_2$$

None is correct

Solution

Question 9

Inversely proportional to the concentration

Independent of the concentration

Directly proportional to the initial concentration

Directly proportional to the final concentration

Solution

Question 10

Both assertion and reason are correct and the reason is correct explanation of assertion.

Both assertion and reason are correct but reason does not explain assertion.

Assertion is correct but reason is incorrect.

Both assertion and reason are incorrect.

Assertion is incorrect but reason is correct.

Solution

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