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JEE Main Chemical Kinetics — practice questions

Explore 56 free Chemical Kinetics questions in JEE Main Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Kinetics questions and exercises with answers

Showing questions 1–30 of 56.

For a first-order reaction, the half-life period $t_{1/2}$ is related to the rate constant $k$ as:Read the answer and worked solution →The units of the rate constant for a zero-order reaction are:Read the answer and worked solution →A catalyst on the bench changes:Read the answer and worked solution →Order or molecularity?Read the answer and worked solution →True or false: order and molecularityRead the answer and worked solution →Read the order off the rate lawRead the answer and worked solution →Complete the definition of orderRead the answer and worked solution →True or false: where a rate law comes fromRead the answer and worked solution →Instantaneous rate or average rate?Read the answer and worked solution →Match each symbol in the Arrhenius equation to its meaningRead the answer and worked solution →Complete the definition of activation energyRead the answer and worked solution →Tap everything that raises the rate of a reactionRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →The Arrhenius equationRead the answer and worked solution →Order the steps: find the order of a reactionRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →True or false: what kinetics studiesRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Tap every factor the chapter says affects the rateRead the answer and worked solution →Complete the collision theory modificationRead the answer and worked solution →Which quantity is being described?Read the answer and worked solution →Assertion and reason: rates and constantsRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →Order the energy story of a reactionRead the answer and worked solution →True or false: the Arrhenius pictureRead the answer and worked solution →Spot the odd one outRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →

Worked practice questions

For a first-order reaction, the half-life period $t_{1/2}$ is related to the rate constant $k$ as:

  1. $t_{1/2} = \dfrac{2.303}{k}$
  2. $t_{1/2} = \dfrac{0.693}{k}$
  3. $t_{1/2} = \dfrac{[A]_0}{2k}$
  4. $t_{1/2} = \dfrac{1}{k[A]_0}$
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Correct answer: B. $t_{1/2} = \dfrac{0.693}{k}$

For a first-order reaction $k = \dfrac{2.303}{t}\log\dfrac{[A]_0}{[A]}$. Setting $[A] = [A]_0/2$ at $t = t_{1/2}$ gives $k t_{1/2} = \ln 2 = 0.693$, hence $t_{1/2} = 0.693/k$. Option B is the zero-order expression option C is the second-order one.

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The units of the rate constant for a zero-order reaction are:

  1. $\text{mol}\,L^{-1}\,s^{-1}$
  2. $L^2\,\text{mol}^{-2}\,s^{-1}$
  3. $L\,\text{mol}^{-1}\,s^{-1}$
  4. $s^{-1}$
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Correct answer: A. $\text{mol}\,L^{-1}\,s^{-1}$

Units of $k$ for an $n$-th order reaction are $\text{mol}^{1-n}\,L^{n-1}\,s^{-1}$. Putting $n=0$ gives $\text{mol}\,L^{-1}\,s^{-1}$, which is the same as the unit of rate itself, since the rate of a zero-order reaction is independent of concentration.

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A catalyst on the bench changes:

  1. The equilibrium constant, shifting K by a known factor
  2. The position of equilibrium toward products only at start
  3. The activation energy and rate, without shifting equilibrium
  4. The standard Gibbs energy of the reaction permanently shifts
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Correct answer: C. The activation energy and rate, without shifting equilibrium

A catalyst lowers $E_a$ and speeds both forward and reverse rates equally equilibrium is unchanged.

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