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Assertion & Reason Test: Chemical Kinetics - NEET MCQ


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12 Questions MCQ Test - Assertion & Reason Test: Chemical Kinetics

Assertion & Reason Test: Chemical Kinetics for NEET 2024 is part of NEET preparation. The Assertion & Reason Test: Chemical Kinetics questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Chemical Kinetics MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Chemical Kinetics below.
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Assertion & Reason Test: Chemical Kinetics - Question 1

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 1
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.

Assertion & Reason Test: Chemical Kinetics - Question 2

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 2
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.
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Assertion & Reason Test: Chemical Kinetics - Question 3

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 3
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.
Assertion & Reason Test: Chemical Kinetics - Question 4

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 4
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.
Assertion & Reason Test: Chemical Kinetics - Question 5

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 5
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.
Assertion & Reason Test: Chemical Kinetics - Question 6

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 6

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.

Assertion & Reason Test: Chemical Kinetics - Question 7

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 7
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.
Assertion & Reason Test: Chemical Kinetics - Question 8

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 8
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.
Assertion & Reason Test: Chemical Kinetics - Question 9

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 9
The assertion is correct as the order can be zero or fraction but it can be determined experimentally.
Assertion & Reason Test: Chemical Kinetics - Question 10

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 10
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.

Assertion & Reason Test: Chemical Kinetics - Question 11

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 11
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.
Assertion & Reason Test: Chemical Kinetics - Question 12

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.

Detailed Solution for Assertion & Reason Test: Chemical Kinetics - Question 12
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.
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