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Direction (Q. Nos. 1-14) This section contains 14 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
A chemical reaction proceeds through the following steps :
Step I, 2A ⇌ X fast
Step II, X+B ⇌ Y slow
Step III, Y+B ⇌ Product fast
Step II, X+B ⇌ Y slow
Step III, Y+B ⇌ Product fast
Q. The rate law for the overall reaction is
- a)K'[A]2
- b)K'[B]2
- c)K'[A][B]
- d)K'[A]2[B]
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Direction (Q. Nos. 1-14) This section contains 14 multiple choice ques...
By slow step II,
By reversible fast step
∴
∴
By reversible fast step
∴
∴
Most Upvoted Answer
Direction (Q. Nos. 1-14) This section contains 14 multiple choice ques...
Explanation:
The rate law for a chemical reaction describes how the rate of the reaction depends on the concentrations of the reactants. It is determined experimentally and can be different for different reactions.
In this given reaction, we are given three steps:
Step I: 2A → X (fast)
Step II: X + B → Y (slow)
Step III: Y → Product (fast)
The rate law for each step can be determined by the rate-determining step, which is the slowest step in the reaction. In this case, Step II is the slowest step.
Rate law for Step II:
The rate law for Step II can be written as:
Rate = k[X][B], where k is the rate constant.
Rate law for the overall reaction:
Since the slowest step determines the rate of the overall reaction, the rate law for the overall reaction is the same as the rate law for the rate-determining step (Step II).
Therefore, the rate law for the overall reaction is:
Rate = k[X][B]
Alternative options:
Let's analyze the other options to see if they could be the rate law for the overall reaction.
a) K[A]2: This option only considers the concentration of reactant A and does not include reactant B. It does not take into account the rate-determining step (Step II) and is therefore not the correct rate law for the overall reaction.
b) K[B]2: This option only considers the concentration of reactant B and does not include reactant A. It does not take into account the rate-determining step (Step II) and is therefore not the correct rate law for the overall reaction.
c) K[A][B]: This option includes both reactants A and B, but it does not consider the concentration of intermediate X. It does not take into account the rate-determining step (Step II) and is therefore not the correct rate law for the overall reaction.
d) K[A]2[B]: This option includes both reactants A and B, as well as the concentration of intermediate X. It takes into account the rate-determining step (Step II) and is therefore the correct rate law for the overall reaction.
The rate law for a chemical reaction describes how the rate of the reaction depends on the concentrations of the reactants. It is determined experimentally and can be different for different reactions.
In this given reaction, we are given three steps:
Step I: 2A → X (fast)
Step II: X + B → Y (slow)
Step III: Y → Product (fast)
The rate law for each step can be determined by the rate-determining step, which is the slowest step in the reaction. In this case, Step II is the slowest step.
Rate law for Step II:
The rate law for Step II can be written as:
Rate = k[X][B], where k is the rate constant.
Rate law for the overall reaction:
Since the slowest step determines the rate of the overall reaction, the rate law for the overall reaction is the same as the rate law for the rate-determining step (Step II).
Therefore, the rate law for the overall reaction is:
Rate = k[X][B]
Alternative options:
Let's analyze the other options to see if they could be the rate law for the overall reaction.
a) K[A]2: This option only considers the concentration of reactant A and does not include reactant B. It does not take into account the rate-determining step (Step II) and is therefore not the correct rate law for the overall reaction.
b) K[B]2: This option only considers the concentration of reactant B and does not include reactant A. It does not take into account the rate-determining step (Step II) and is therefore not the correct rate law for the overall reaction.
c) K[A][B]: This option includes both reactants A and B, but it does not consider the concentration of intermediate X. It does not take into account the rate-determining step (Step II) and is therefore not the correct rate law for the overall reaction.
d) K[A]2[B]: This option includes both reactants A and B, as well as the concentration of intermediate X. It takes into account the rate-determining step (Step II) and is therefore the correct rate law for the overall reaction.
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Direction (Q. Nos. 1-14) This section contains 14 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.A chemical reaction proceeds through the following steps :Step I, 2A ⇌ X fastStep II, X+B ⇌ Y slowStep III, Y+B ⇌Product fastQ.The rate law for the overall reaction isa)K'[A]2b)K'[B]2c)K'[A][B]d)K'[A]2[B]Correct answer is option 'D'. Can you explain this answer?
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Direction (Q. Nos. 1-14) This section contains 14 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.A chemical reaction proceeds through the following steps :Step I, 2A ⇌ X fastStep II, X+B ⇌ Y slowStep III, Y+B ⇌Product fastQ.The rate law for the overall reaction isa)K'[A]2b)K'[B]2c)K'[A][B]d)K'[A]2[B]Correct answer is option 'D'. 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 Direction (Q. Nos. 1-14) This section contains 14 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.A chemical reaction proceeds through the following steps :Step I, 2A ⇌ X fastStep II, X+B ⇌ Y slowStep III, Y+B ⇌Product fastQ.The rate law for the overall reaction isa)K'[A]2b)K'[B]2c)K'[A][B]d)K'[A]2[B]Correct answer is option 'D'. 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 Direction (Q. Nos. 1-14) This section contains 14 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.A chemical reaction proceeds through the following steps :Step I, 2A ⇌ X fastStep II, X+B ⇌ Y slowStep III, Y+B ⇌Product fastQ.The rate law for the overall reaction isa)K'[A]2b)K'[B]2c)K'[A][B]d)K'[A]2[B]Correct answer is option 'D'. Can you explain this answer?.
Direction (Q. Nos. 1-14) This section contains 14 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.A chemical reaction proceeds through the following steps :Step I, 2A ⇌ X fastStep II, X+B ⇌ Y slowStep III, Y+B ⇌Product fastQ.The rate law for the overall reaction isa)K'[A]2b)K'[B]2c)K'[A][B]d)K'[A]2[B]Correct answer is option 'D'. 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 Direction (Q. Nos. 1-14) This section contains 14 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.A chemical reaction proceeds through the following steps :Step I, 2A ⇌ X fastStep II, X+B ⇌ Y slowStep III, Y+B ⇌Product fastQ.The rate law for the overall reaction isa)K'[A]2b)K'[B]2c)K'[A][B]d)K'[A]2[B]Correct answer is option 'D'. 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 Direction (Q. Nos. 1-14) This section contains 14 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.A chemical reaction proceeds through the following steps :Step I, 2A ⇌ X fastStep II, X+B ⇌ Y slowStep III, Y+B ⇌Product fastQ.The rate law for the overall reaction isa)K'[A]2b)K'[B]2c)K'[A][B]d)K'[A]2[B]Correct answer is option 'D'. Can you explain this answer?.
Solutions for Direction (Q. Nos. 1-14) This section contains 14 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.A chemical reaction proceeds through the following steps :Step I, 2A ⇌ X fastStep II, X+B ⇌ Y slowStep III, Y+B ⇌Product fastQ.The rate law for the overall reaction isa)K'[A]2b)K'[B]2c)K'[A][B]d)K'[A]2[B]Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12.
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