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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)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
Correct answer is option 'B'. Can you explain this answer?
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Directions: In the following questions, A statement of Assertion (A) ...
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.
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Directions: In the following questions, A statement of Assertion (A) ...
Assertion (A): For complex reactions, molecularity and order are not the same.
Reason (R): Order of reaction may be zero.
The correct answer is option B: Both A and R are true but R is NOT the correct explanation of A.
Explanation:
Molecularity refers to the number of molecules or atoms that participate in an elementary reaction. It is a concept used to classify elementary reactions based on the number of reactant molecules involved.
Order of reaction refers to the power to which the concentration of a reactant is raised in the rate equation of a chemical reaction. It is determined experimentally and does not have a direct relationship with the molecularity of the reaction.
Complex Reactions:
Complex reactions involve multiple elementary steps or intermediate species. These reactions cannot be classified using molecularity alone because the overall reaction may involve multiple reactant molecules in different steps.
Example:
Consider the reaction: A + B → C
This reaction could occur in multiple elementary steps:
Step 1: A + B → X (molecularity = 2)
Step 2: X → C (molecularity = 1)
In this case, the overall reaction has a molecularity of 2 (since two reactant molecules are involved), but the order of reaction can vary depending on the rate-determining step.
Order of Reaction:
The order of reaction is determined experimentally by measuring how the rate of reaction changes with respect to changes in the concentration of reactants. It can be zero, first, second, or even fractional.
Reasoning:
The reason provided states that the order of reaction may be zero, which is true. In some reactions, the rate of reaction does not depend on the concentration of certain reactants. In such cases, the order with respect to those reactants is considered to be zero.
However, this reasoning does not provide a correct explanation for the assertion. The assertion states that molecularity and order are not the same for complex reactions, which is true. The complexity of a reaction arises from multiple steps and intermediates, which cannot be solely determined by the order of reaction.
Hence, both the assertion and the reason are true, but the reason does not explain the assertion correctly. Therefore, option B is the correct answer.
Reason (R): Order of reaction may be zero.
The correct answer is option B: Both A and R are true but R is NOT the correct explanation of A.
Explanation:
Molecularity refers to the number of molecules or atoms that participate in an elementary reaction. It is a concept used to classify elementary reactions based on the number of reactant molecules involved.
Order of reaction refers to the power to which the concentration of a reactant is raised in the rate equation of a chemical reaction. It is determined experimentally and does not have a direct relationship with the molecularity of the reaction.
Complex Reactions:
Complex reactions involve multiple elementary steps or intermediate species. These reactions cannot be classified using molecularity alone because the overall reaction may involve multiple reactant molecules in different steps.
Example:
Consider the reaction: A + B → C
This reaction could occur in multiple elementary steps:
Step 1: A + B → X (molecularity = 2)
Step 2: X → C (molecularity = 1)
In this case, the overall reaction has a molecularity of 2 (since two reactant molecules are involved), but the order of reaction can vary depending on the rate-determining step.
Order of Reaction:
The order of reaction is determined experimentally by measuring how the rate of reaction changes with respect to changes in the concentration of reactants. It can be zero, first, second, or even fractional.
Reasoning:
The reason provided states that the order of reaction may be zero, which is true. In some reactions, the rate of reaction does not depend on the concentration of certain reactants. In such cases, the order with respect to those reactants is considered to be zero.
However, this reasoning does not provide a correct explanation for the assertion. The assertion states that molecularity and order are not the same for complex reactions, which is true. The complexity of a reaction arises from multiple steps and intermediates, which cannot be solely determined by the order of reaction.
Hence, both the assertion and the reason are true, but the reason does not explain the assertion correctly. Therefore, option B is the correct answer.
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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)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'B'. Can you explain this answer?
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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)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about 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)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'B'. Can you explain this answer?.
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)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about 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)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'B'. Can you explain this answer?.
Solutions for 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)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12.
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ample number of questions to practice 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)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Class 12 tests.
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