Chemical Kinetics Test

Result

Chemical Kinetics Test - 22

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Rate of reaction doubles when concentration of reactant is doubled if it is a first order reaction.
Reason (R): Rate constant also doubles.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

For first order reaction
Rate₁ = k [A₁]
[A₂] = [2A₁]
Rate₂ = k[2A₁]
Rate₂ = k x 2 Rate₁
For a given reaction, rate constant is constant and independent of the concentration of reactant.
Question 2
1 / -0

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Dust particles suspended in the air inside unheated gain electrons can sometimes react explosively.
Reason (R): The dust particles have a large surface area for the reaction.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

Since the dust particles have large surface area for the reaction so these particles suspended in the air inside unheated gain electrons can sometimes react explosively.
Question 3
1 / -0

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): The rate of reaction increases with increase in temperature.
Reason (R): The reactant molecules collide less frequently.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

As the temperature of a reaction is increased, the rate of the reaction increases because the reactant molecules collide more frequently and with greater energy per collision.
Question 4
1 / -0

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Elementary reactions have the same value of order and molecularity.
Reason (R): Molecularity is the number of molecules that participate in the reaction, while order is an experimental quantity.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

An elementary reaction is a chemical reaction in which one or more chemical species react directly to form products in a single reaction step and with a single transition state. Elementary reactions have the same value of order and molecularity. Molecularity is the number of molecules that participate in the reaction, while order is an experimental quantity.
Question 5
1 / -0

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): For complex reactions molecularity and order are not the same.
Reason (R): Order of reaction may be zero.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

For a complex reaction, Order of overall reaction = molecularity of slowest step As rate of overall reaction depends upon total number of molecules involved in slowest step of the reaction. Hence, for complex reactions, molecularity and order are not the same.
Question 6
1 / -0

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Hydrolysis of an ester follows first order kinetics.
Reason (R): Concentration of water remains nearly constant during the course of the reaction.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

Hydrolysis of an ester follows first order kinetics as [H₂O] remains nearly constant during the course of the reaction. It is a pseudo first order reaction.
Question 7
1 / -0

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): For a first order reaction, half-life period is independent of initial concentration of the reacting species.
Reason (R): The half-life of a reaction is the time in which the reactant concentration is reduced to one half of its initial concentration.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

For a first order reaction, half-life period is independent of initial concentration of the reacting species and is calculated from the rate constant or vice versa.
Question 8
1 / -0

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Order of the reaction can be zero or fractional.
Reason (R): We cannot determine order from a balanced chemical equation.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

Order of a reaction may be zero or fractional. It can be determined through the rate law expression by the sum of power of reactants.
Question 9
1 / -0

In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Order of the reaction can be zero or fractional.
Reason : We cannot determine order from a balanced chemical equation.

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

B
B. Both assertion and reason are true but the reason is not the correct explanation of assertion.

C
C. Assertion is true but reason is false.

D
D. Assertion is false but reason is true.

Solution

The assertion is correct as the order can be zero or fraction but it can be determined experimentally.
Question 10
1 / -0

In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion : Order and molecularity are same.
Reason : Order is determined experimentally and molecularity is the sum of the stoichiometric coefficient of rate determining elementary step.

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

B
B. Both assertion and reason are true but the reason is not the correct explanation of assertion.

C
C. Assertion is true but reason is false.

D
D. Assertion is false but reason is true.

Solution

Order and molecularity can be the same only for elementary reactions and it is different for complex reactions.
Order is determined experimentally and molecularity is the sum of the stoichiometric coefficient of rate-determining elementary step.
Question 11
1 / -0

In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion : The enthalpy of reaction remains constant in the presence of a catalyst.
Reason : A catalyst participating in the reaction, forms a different activated complex and lowers down the activation energy but the difference in energy of reactant and product remains the same.

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

B
B. Both assertion and reason are true but the reason is not the correct explanation of assertion.

C
C. Assertion is true but reason is false.

D
D. Assertion is false but reason is true.

Solution

It is believed that the catalyst provides an alternate pathway or reaction mechanism by reducing the activation energy between reactants and products and hence lowering the potential energy barrier but the enthalpy of reaction remains constant.
Question 12
1 / -0

In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion : Rate constants determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.
Reason : Reactant molecules undergo chemical change irrespective of their orientation during collision.

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

B
B. Both assertion and reason are true but the reason is not the correct explanation of assertion.

C
C. Assertion is true but reason is false.

D
D. Assertion is false but reason is true.

Solution

Rate constants determined from Arrhenius equation are fairly accurate for simple and complex molecules because only those molecules which have proper orientation during a collision (i.e., effective collision) and sufficient kinetic energy lead the chemical change.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Chemical Kinetics Test - 22

Result

Chemical Kinetics Test - 22

Score

-

Rank

-

SHARING IS CARING

Question 1

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 2

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 3

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 4

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 5

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 6

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 7

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 8

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 9

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

B. Both assertion and reason are true but the reason is not the correct explanation of assertion.

C. Assertion is true but reason is false.

D. Assertion is false but reason is true.

Solution

Question 10

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

B. Both assertion and reason are true but the reason is not the correct explanation of assertion.

C. Assertion is true but reason is false.

D. Assertion is false but reason is true.

Solution

Question 11

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

B. Both assertion and reason are true but the reason is not the correct explanation of assertion.

C. Assertion is true but reason is false.

D. Assertion is false but reason is true.

Solution

Question 12

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

B. Both assertion and reason are true but the reason is not the correct explanation of assertion.

C. Assertion is true but reason is false.

D. Assertion is false but reason is true.

Solution