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Which among the following statement is not true for rate constant of a reaction?
  • a)
    Rate constant depend upon the concentration of the reactants
  • b)
    Unit of rate constant depend upon the order of reaction
  • c)
    Rate constant has a definite value at a particular temperature
  • d)
    Rate constant changes with temperature
Correct answer is option 'A'. Can you explain this answer?
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Which among the following statement is not true for rate constant of a...
Rate constant is independent of concentration of reactant.
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Which among the following statement is not true for rate constant of a...
Rate Constant of a Reaction

Rate constant is an important parameter in chemical kinetics that determines the rate of a chemical reaction. It is denoted by k and has different units depending upon the order of the reaction. The rate constant has the following characteristics:

Definite value at a particular temperature

The rate constant is a specific value that is determined experimentally at a particular temperature. It is a constant value that remains the same for a given reaction at a given temperature. However, it can change with a change in temperature.

Changes with temperature

The rate constant is dependent upon temperature. It increases with an increase in temperature and decreases with a decrease in temperature. This is because the rate of reaction depends on the energy of the reacting molecules, which increases with an increase in temperature.

Unit of rate constant depend upon the order of reaction

The unit of rate constant depends upon the order of the reaction. For a first-order reaction, the unit of k is s-1, for a second-order reaction, it is dm3 mol-1 s-1, and for a zero-order reaction, it is mol dm-3 s-1.

Rate constant depend upon the concentration of the reactants

This statement is not true. The rate constant is independent of the concentration of the reactants. It is only dependent upon temperature and the nature of the reaction. The rate of reaction depends on the concentration of the reactants, but the rate constant remains the same for a given reaction at a given temperature.

Conclusion

In conclusion, the rate constant is a constant value that has a definite value at a particular temperature and changes with temperature. Its unit depends upon the order of the reaction but is independent of the concentration of the reactants.
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Community Answer
Which among the following statement is not true for rate constant of a...
The rate constant is only affected by the type of a reaction(order of a reaction) and temperature.
for instance when a given reaction is reversed the K2 = 1/K1.
if the temperature is Increased the rate constant also increases.
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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: For a reaction: P + 2Q → Products, Rate = k [P]1/2[Q]1 so the order of reaction is 1.5Reason: Order of reaction is the sum of stoichiometric coefficients of the reactants.

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: Reactions can occur at different speeds.Reason: Rate of reaction is also called speed of reaction.

Which among the following statement is not true for rate constant of a reaction?a)Rate constant depend upon the concentration of the reactantsb)Unit of rate constant depend upon the order of reactionc)Rate constant has a definite value at a particular temperatured)Rate constant changes with temperatureCorrect answer is option 'A'. Can you explain this answer?
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Which among the following statement is not true for rate constant of a reaction?a)Rate constant depend upon the concentration of the reactantsb)Unit of rate constant depend upon the order of reactionc)Rate constant has a definite value at a particular temperatured)Rate constant changes with temperatureCorrect answer is option 'A'. 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 Which among the following statement is not true for rate constant of a reaction?a)Rate constant depend upon the concentration of the reactantsb)Unit of rate constant depend upon the order of reactionc)Rate constant has a definite value at a particular temperatured)Rate constant changes with temperatureCorrect answer is option 'A'. 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 Which among the following statement is not true for rate constant of a reaction?a)Rate constant depend upon the concentration of the reactantsb)Unit of rate constant depend upon the order of reactionc)Rate constant has a definite value at a particular temperatured)Rate constant changes with temperatureCorrect answer is option 'A'. Can you explain this answer?.
Solutions for Which among the following statement is not true for rate constant of a reaction?a)Rate constant depend upon the concentration of the reactantsb)Unit of rate constant depend upon the order of reactionc)Rate constant has a definite value at a particular temperatured)Rate constant changes with temperatureCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
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