← Back to shiwamsclass.com← Website
← CBSE Class 12 PYQ

Chemical Kinetics

CBSE Class 12 · Chemistry · 39 past questions

  1. Q1 2026
    Identify the correct statement…
  2. Q2 2026
    The order for the given reaction is…
  3. Q3 2026
    For question number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled…
  4. Q4 2026
    The concentration of the reactant is reduced from 0.6 mol L$^{-1}$ to 0.2 mol L$^{-1}$ in 5 minutes in a…
  5. Q5 2026
    Which of the following curve represents the first order reaction ? (with a figure)
  6. Q6 2026
    Which of the following represents the fraction of molecules with energies equal to or greater than E$_a$ ?
  7. Q7 2026
    Following reaction takes place in one step…
  8. Q8 2026
    For the first order thermal decomposition reaction, following data was obtained…
  9. Q9 2026
    For a reaction $3A \rightarrow 2B$, the rate of reaction $\dfrac{+d[B]}{dt}$ is equal to…
  10. Q10 2026
    For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other…
  11. Q11 2026
    For a reaction A + B $\to$ Products, the rate law is…
  12. Q12 2026
    The half-life period of a radioactive element is $1{\cdot}5\times10^{10}$ years. Calculate the time in which…
  13. Q13 2025
    Reactant 'A' underwent a decomposition reaction. The concentration of 'A' was measured periodically and…
  14. Q14 2025
    Which among the following is a false statement ?
  15. Q15 2025
    The number of molecules that react with each other in an elementary reaction is a measure of the…
  16. Q16 2025
    For question number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled…
  17. Q17 2025
    The rate constant for a zero order reaction A $\to$ P is 0.0030 mol L$^{-1}$s$^{-1}$. How long will it take…
  18. Q18 2025
    A certain reaction is 50% complete in 20 minutes at 300 K and the same reaction is 50% complete in 5 minutes…
  19. Q19 2024
    The addition of catalyst during a chemical reaction alters which of the following quantities of the reaction ?
  20. Q20 2024
    For the elementary reaction P → Q, the rate of disappearance of 'P' increases by a factor of 8 upon doubling…
  21. Q21 2024
    A first order reaction has a rate constant 1.25 × 10⁻³ s⁻¹. How long will 5 g of this reactant take to reduce…
  22. Q22 2024
    The rate of a gaseous reaction triples when temperature is increased from 17°C to 27°C. Calculate the energy…
  23. Q23 2024
    When a catalyst increases the rate of a chemical reaction, then the rate constant (k)…
  24. Q24 2024
    For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other…
  25. Q25 2024
    A first-order reaction is 25% complete in 40 minutes. Calculate the value of rate constant. In what time will…
  26. Q26 2024
    For the reaction X + 2Y → P, the differential form equation of the rate law is…
  27. Q27 2024
    In the Arrhenius equation, when log k is plotted against 1/T, a straight line is obtained whose…
  28. Q28 2024
    The following initial rate data were obtained for the reaction…
  29. Q29 2023
    The slope in the plot of $\ln$[R] vs. time for a first order reaction is
  30. Q30 2023
    For the reaction 3A → 2B, rate of reaction $+\frac{d[B]}{dt}$ is equal to
  31. Q31 2023
    A first order reaction is 50% complete in 30 minutes at 300 K and in 10 minutes at 320 K. Calculate…
  32. Q32 2023
    The unit of the rate of reaction is the same as that of the rate constant for a…
  33. Q33 2023
    For Questions number 15 to 18, two statements are given — one labelled as Assertion (A) and the other…
  34. Q34 2023
    A chemical reaction…
  35. Q35 2023
    The rate of a reaction doubles when temperature changes from 27°C to 37°C. Calculate energy of activation for…
  36. Q36 2023
    Which of the following is affected by catalyst ?
  37. Q37 2023
    Assertion (A) : The molecularity of the reaction H$_2$ + Br$_2$ $\longrightarrow$ 2HBr appears to be 2.…
  38. Q38 2022
    Define rate of reaction. Write two factors that affect the rate of reaction.
  39. Q39 2022
    A first order reaction is 50% complete in 40 minutes. Calculate the time required for the completion of 90%…