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Chemical Kinetics - ISC Class 12 Chemistry Questions with Answers

65 past-paper questions on Chemical Kinetics from ISC Class 12 Chemistry papers (2027-2018), newest first. Open one to see its answer.

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Rohan, a patient of thyroid disorder, was given certain amount of radioactive Iodine-131 as a part of his treatment. The… 2027 · 2 marks · Numerical
Answer the following questions: For a given first order reaction, it takes 5 minutes for the initial concentration of… 2027 · 3 marks · Numerical
The following data was obtained for a hypothetical reaction $2A + B \rightarrow 2AB$ S. No. $[A]$ (mol $L^{-1}$) $[B]$ (mol… 2027 · 1 mark · MCQ
In general, it is observed that the rate of a reaction becomes double with every $10^\circ\text{C}$ rise in temperature. If this… 2027 · 2 marks · Numerical
Consider yourself a research scholar in the forensic science department studying the age of a dead biological sample. During one… 2026 · 2 marks · Numerical
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [electrophilic, four, 4-bromophenol… 2026 · 1 mark · Fill in
How will the rate of reaction be affected by the presence of catalyst? The rate constant for a reaction is… 2026 · 3 marks · Numerical
In general, it is observed that the rate of a chemical reaction becomes double with every $10^\circ\text{C}$ rise in temperature… 2026 · 2 marks · Numerical
Carbon dating method is a useful tool to estimate the age of fossils. A radioactive carbon-14 isotope decays with a half-life of… 2026 · 2 marks · Numerical
A reaction is of first order with respect to reactant [A] and second order with regard to reactant [B]. What is the effect on… 2026 · 2 marks · Short answer
Answer the following: The rate constant of a first order reaction increases five times when the temperature is raised from… 2026 · 3 marks · Numerical
Choose the appropriate word(s) from the bracket [first, alc. AgCN, primary, decrease, third, increase, zero, Lucas, alc. KCN… 2026 · 1 mark · Fill in
A first order reaction is $40\%$ complete in $20\text{ minutes}$. Calculate the time required for $90\%$ completion of the same… 2026 · 2 marks · Numerical
The unit of rate constant of a reaction is same as that of its rate of reaction. Find the order of this reaction. Give one… 2026 · 3 marks · Short answer
Consider the mechanism given below derived from spectrochemical analysis of the reaction between $\text{NO}$ and $\text{F}_2$… 2026 · 2 marks · Short answer
Choose the appropriate word(s) from the bracket [first, zero, second, Raoult’s law, non-ideal, addition, substitution, Henry’s… 2026 · 1 mark · Fill in
In the year 1889, Svante Arrhenius proposed that the dependence of the rate constant ($k$) of a reaction on temperature can be… 2025 · 3 marks · Case based
The data given below is for the reaction between $[\text{NO}]$ and $[\text{Cl}_2]$ to form $\text{NOCl}$ at $25^\circ\text{C}$… 2025 · 3 marks · Numerical
It is generally observed that the rate of a chemical reaction becomes double with every $10^\circ\text{C}$ rise in temperature… 2025 · 2 marks · Numerical
For a reaction $\text{A} \rightarrow \text{B} + \text{C}$, when a student X doubled the concentration of ‘A’, the rate of… 2025 · 1 mark · MCQ
Answer the following: A patient was given a certain amount of iodine-131 as a part of a diagnostic procedure for thyroid… 2025 · 3 marks · Short answer
In the reaction $2\text{NO} + \text{O}_2 \longrightarrow 2\text{NO}_2$, the rate law is… 2025 · 2 marks · Short answer
The half-life period for radioactive carbon, $^{14}\text{C}$ is $5730\text{ years}$. An ancient sample of wood has only $80\%$ of… 2025 · 2 marks · Numerical
Which of the following combinations is INCORRECT regarding order and molecularity of a hypothetical reaction? 2025 · 1 mark · MCQ
The rate of a reaction depends on the concentration of reactants. The rate law for a hypothetical reaction… 2025 · 3 marks · Case based
Following rate data was obtained at 298 K for the reaction $\text{A} + \text{B} \longrightarrow \text{C} + \text{D}$: Answer the… 2025 · 3 marks · Numerical
Study the graph given below and label the numbers: 2025 · 2 marks · Short answer
From a plot of rate (Y-axis) and concentration (X- axis), a student concluded that the order of reaction is zero. What he must… 2025 · 1 mark · MCQ
Consider the data given below for the reaction $\text{A} + \text{B} \longrightarrow \text{Product}$ S.No. conc. of [A]… 2025 · 3 marks · Numerical
The half-life of a first order reaction does not depend on initial concentration of the reactant. 2025 · 1 mark · Assertion-reason
A plant or any other living being maintains a reasonable balance of C-14 (radioactive carbon) in its tissue during its lifetime… 2025 · 3 marks · Case based
Answer the following questions: Aman and Rohan were working on the kinetics involved in decomposition of hydrogen peroxide in the… 2025 · 3 marks · Short answer
Find the three-fourths life, $t_{3/4}$ of a first order reaction, $k=7.4\times 10^{-5}\text{ s}^{-1}$. 2025 · 2 marks · Numerical
Predict the order of reaction and name X and Y axes. 2025 · 2 marks · Short answer
A first order reaction is half complete in 20 minutes, it will be 75% complete in ____ minutes and 87.5% complete in ____ minutes. 2025 · 1 mark · Fill in
The data in the table given below was obtained in a series of experiments on the rate of the reaction between compounds [A] and… 2024 · 3 marks · Short answer
The rate constant of a reaction at $500\text{ K}$ and $700\text{ K}$ are $0\cdot02\text{ sec}^{-1}$ and… 2024 · 3 marks · Numerical
Choose the appropriate word(s) from the bracket [lead poisoning, zero, phosgene, dependent, cancer, independent, diethyl ether… 2024 · 1 mark · Fill in
For the reaction $\text{A} + \text{B} \rightleftharpoons \text{Product}$, following data was obtained: Experiment number Initial… 2024 · 3 marks · Short answer
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [decreases, $\text{CN}^-$ ion… 2024 · 1 mark · Fill in
The half-life period ($t_{1/2}$) for decay of radioactive $^{14}\text{C}$ is $5730\text{ years}$. An ancient piece of wood has… 2024 · 3 marks · Numerical
Suppose 50 bacteria are placed in a flask containing nutrients, so that they can multiply. A study at $35^\circ\text{C}$ gave the… 2023 · 3 marks · Short answer
$20\%$ of a first order reaction is completed in five minutes. How much time will the $60\%$ reaction take to complete? Calculate… 2023 · 3 marks · Numerical
Match the following: 2023 · 4 marks · Match
A first order reaction is $50\%$ completed in $40\text{ minutes}$ at $300\text{ K}$ and in $20\text{ minutes}$ at $320\text{ K}$… 2023 · 3 marks · Numerical
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [two, Williamson’s synthesis, three… 2023 · 4 marks · Fill in
The rate constant for a first order reaction becomes six times when the temperature is increased from $350\text{ K}$ to… 2023 · 3 marks · Numerical
Select and write the correct alternative from the choices given below: (i) The reaction of a primary amine with chloroform and… 2023 · 4 marks · Short answer
(i) Assertion: If a solution contains both $\text{H}^+$ and $\text{Na}^+$ ions, the $\text{H}^+$ ions are reduced first at… 2023 · 2 marks · Short answer
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [stable, low, aldehyde, unstable, 6, 4… 2023 · 4 marks · Fill in
Select and write the correct alternative from the choices given below: An alkyl isocyanide on complete reduction gives: For a… 2023 · 4 marks · Short answer
The rate of reaction becomes four times when the temperature changes from $293\text{ K}$ to $313\text{ K}$. Calculate the energy… 2022 · 2 marks · Numerical
Answer the following: Define molecularity of a reaction. Give one difference between the order of reaction and its molecularity… 2022 · 3 marks · Short answer
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: (two, four, $\text{sec}^{-1}$… 2022 · 3 marks · Fill in
Answer the following: For a first order reaction, show that the time required for the completion of $99\%$ reaction is twice the… 2022 · 3 marks · Short answer
A first order reaction is $50\%$ completed in $30\text{ minutes}$ at $300\text{ K}$ and in $10\text{ minutes}$ at $320\text{ K}$… 2020 · 3 marks · Numerical
$25\%$ of a first order reaction is completed in $30\text{ minutes}$. Calculate the time taken in minutes for the reaction to go… 2019 · 2 marks · Numerical
For the reaction $\text{A} + \text{B} \rightarrow \text{C} + \text{D}$, the initial rate for different reactions and initial… 2019 · 2 marks · Short answer
Show that for a first order reaction the time required to complete $75\%$ of reaction is about $2$ times more than that required… 2019 · 2 marks · Derivation
Identify the reaction order from each of the following rate constants… 2018 · 2 marks · Short answer
A substance decomposes by following first order kinetics. If $50\%$ of the compound is decomposed in $120\text{ minutes}$, how… 2018 · 2 marks · Numerical
Write two differences between ‘order of reaction’ and ‘molecularity of reaction’. 2018 · 2 marks · Short answer
Write the rate law expression for the reaction $\text{A} + \text{B} + \text{C} \rightarrow \text{D} + \text{E}$, if the order of… 2018 · 2 marks · Short answer
The rate of reaction becomes four times when the temperature changes from $293\text{ K}$ to $313\text{ K}$. Calculate the energy… 2018 · 2 marks · Numerical
$40\%$ of a first order reaction is completed in $50\text{ minutes}$. How much time will it take for the completion of $80\%$ of… 2018 · 2 marks · Short answer

Chemical Kinetics - ISC Class 12 Chemistry Questions with Answers

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