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CUET · CHEMISTRY · PYQ PAPER 2023

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Kinetic studies not only help us to determine the rate of a chemical reaction but also describe the conditions by which the reaction rates can be altered. The factors such as concentration, temperature, pressure and catalyst affect the rate of a reaction.
The speed of a reaction or the rate of a reaction can be defined as the change in concentration of a reactant or product in unit time.
Rate \(=k[A]^{ a }[B]^{ y }\)
Here \(k\) is the rate constant
\(x+y\) gives the overall order of a reaction, whereas \(x\) and \(y\) represent the order with respect to the reactants \(A\) and \(B\), respectively.
The unit of rate constant for first order reaction is:

  1. A \(molL ^{-1} s^{-1}\)
  2. B \(molL s ^{-1}\)
  3. C \(L ^{-1} s^{-1}\)
  4. D \(s ^{-1}\)
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Correct Answer

(D) \(s ^{-1}\)

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Detailed explanation

\(\text{Unit of Rate} = \text{mol L}^{-1} \text{s}^{-1}\) \(\text{For first order reaction, Rate} = k[\text{Concentration}]^1\) \(\text{mol L}^{-1} \text{s}^{-1} = k (\text{mol L}^{-1})\) \(k = \text{s}^{-1}\)
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