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Which of the following statements is false for the reaction H2 + Br2 → 2HBr?
The rate law is dx/dt = k[H2][Br2]½ .
  • a)
    Order of reaction is 1.5.
  • b)
    Molecularity of the reaction is 2.
  • c)
    By increasing the concentration of Br2 four times, the rate of the reaction is doubled.
  • d)
    None of these
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
Which of the following statements is false for the reaction H2 + Br2 ...
False Statement: Order of reaction is 1.5

Explanation:
1. Rate Law: The rate law for a chemical reaction expresses the relationship between the rate of the reaction and the concentrations of the reactants. In this case, the rate law is given as dx/dt = k[H2][Br2]½, where dx/dt represents the rate of the reaction, k is the rate constant, [H2] is the concentration of H2, and [Br2] is the concentration of Br2.

2. Order of Reaction: The order of reaction refers to the exponent to which the concentration of a reactant is raised in the rate law. In this case, the order of reaction with respect to H2 is 1 and the order of reaction with respect to Br2 is ½. By adding these orders, we get a total order of reaction of 1 + ½ = 1.5.

3. Molecularity of the Reaction: Molecularity refers to the number of molecules (or atoms) that participate in the elementary step of a reaction. In this case, the given reaction is a single step reaction, where one molecule of H2 reacts with one molecule of Br2 to form two molecules of HBr. Therefore, the molecularity of the reaction is 2.

4. Effect of Concentration on Rate: According to the rate law, the rate of the reaction is directly proportional to the concentration of H2 and the square root of the concentration of Br2. If the concentration of Br2 is increased four times, the rate of the reaction would increase by a factor of √4 = 2, as the rate is directly proportional to the square root of the concentration.

Conclusion:
From the given options, the false statement is that the order of reaction is 1.5. The correct order of reaction is 1, as the rate law shows a first-order dependence on H2 and a half-order dependence on Br2.
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Community Answer
Which of the following statements is false for the reaction H2 + Br2 ...
The given reaction H2 + Br2 2HBr is a bi-molecular reaction, hence the molecularity is 2.
The order can be determined as
Order = 1 + ½ = 3/2 = 1.5
If concentrate of Br2 is increased 4 times,
R2 = k[H2][4Br2]1/2
R2 = 2k[H2][Br2]1/2
R2 = 2R1
i.e., rate increases 2 times.
Hence, all the statements are correct.
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Read the passage given below and answer the following questions:The rate of a reaction, which may also be called its velocity or speed, can be defined with relation to the concentration of any of the reacting substances, or to that of any product of the reaction. If the species chosen is a reactant which has a concentration c at time t the rate is - dc/dt, while the rate with reference to a product having a concentration x at time t is dx/dt. Any concentration units may be used for expressing the rate; thus, if moles per liter are employed for concentration and seconds for the time, the units for the rate are moles litre–1sec–1. For gas reactions pressure units are sometimes used in place of concentrations, so that legitimate units for the rate would be (mm. Hg) sec–1 and atm. sec–1 The order of a reaction concerns the dependence of the rate upon the concentrations of reacting substances; thus, if the rate is found experimentally to be proportional to the ath power of the concentration of one of the reactants A, to the both power of the concentration of a second reactant B, and so forth, via., rate = k CAα CAβ the over-all order of the reaction is simply n = α + β + ----- (2) Such a reaction is said to be of the αth order with respect to the substance A, the βth order with respect to B.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 on the basis of the above passage.Assertion: Rate of reaction is a measure of change in concentration of reactant with respect to time.Reason: Rate of reaction is a measure of change in concentration of product with respect to time.

Read the passage given below and answer the following questions:The rate of a reaction, which may also be called its velocity or speed, can be defined with relation to the concentration of any of the reacting substances, or to that of any product of the reaction. If the species chosen is a reactant which has a concentration c at time t the rate is - dc/dt, while the rate with reference to a product having a concentration x at time t is dx/dt. Any concentration units may be used for expressing the rate; thus, if moles per liter are employed for concentration and seconds for the time, the units for the rate are moles litre–1sec–1. For gas reactions pressure units are sometimes used in place of concentrations, so that legitimate units for the rate would be (mm. Hg) sec–1 and atm. sec–1 The order of a reaction concerns the dependence of the rate upon the concentrations of reacting substances; thus, if the rate is found experimentally to be proportional to the ath power of the concentration of one of the reactants A, to the both power of the concentration of a second reactant B, and so forth, via., rate = k CAα CAβ the over-all order of the reaction is simply n = α + β + ----- (2) Such a reaction is said to be of the αth order with respect to the substance A, the βth order with respect to B.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 on the basis of the above passage.Assertion: The unit of k is independent of order of reaction.Reason: The unit of k is moles L–1s–1.

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Which of the following statements is false for the reaction H2 + Br2 → 2HBr?The rate law is dx/dt = k[H2][Br2]½ .a)Order of reaction is 1.5.b)Molecularity of the reaction is 2.c)By increasing the concentration of Br2 four times, the rate of the reaction is doubled.d)None of theseCorrect answer is option 'D'. Can you explain this answer?
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Which of the following statements is false for the reaction H2 + Br2 → 2HBr?The rate law is dx/dt = k[H2][Br2]½ .a)Order of reaction is 1.5.b)Molecularity of the reaction is 2.c)By increasing the concentration of Br2 four times, the rate of the reaction is doubled.d)None of theseCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following statements is false for the reaction H2 + Br2 → 2HBr?The rate law is dx/dt = k[H2][Br2]½ .a)Order of reaction is 1.5.b)Molecularity of the reaction is 2.c)By increasing the concentration of Br2 four times, the rate of the reaction is doubled.d)None of theseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is false for the reaction H2 + Br2 → 2HBr?The rate law is dx/dt = k[H2][Br2]½ .a)Order of reaction is 1.5.b)Molecularity of the reaction is 2.c)By increasing the concentration of Br2 four times, the rate of the reaction is doubled.d)None of theseCorrect answer is option 'D'. Can you explain this answer?.
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