Chemical Kinetics Questions

25 Practice QuestionsStart Practicing Now

[Medium]The half-life of a first-order radioactive decay is 30 minutes. What percentage of the original reactant remains after 90 minutes?...
[Medium]The acid-catalysed hydrolysis of ethyl acetate in aqueous solution is an example of:...
[Hard]The rate constant of a reaction at 500 K is 2.0 × 10⁻³ s⁻¹ and at 700 K is 4.0 × 10⁻² s⁻¹. The activation energy of the reaction is approximately: (R ...
[Hard]The rate of a reaction doubles when the temperature is raised from 27°C to 37°C. The activation energy of the reaction is approximately: (R = 8.314 J ...
[Medium]A first-order reaction has a rate constant of 1.386 × 10⁻² min⁻¹. The time required for 75% completion of the reaction is:...
[Easy]Which of the following statements correctly describes molecularity of a reaction?...
[Medium]For a reaction A + B → Products, the rate law is: rate = k[A]²[B]. If the concentration of A is doubled and B is halved, the new rate compared to the ...
[Easy]For the reaction 2N₂O₅(g) → 4NO₂(g) + O₂(g), if the rate of disappearance of N₂O₅ is 0.02 mol L⁻¹ s⁻¹, the rate of formation of NO₂ is:...
[Easy]The unit of the rate constant for a second-order reaction is:...
[Medium]For a zero-order reaction, the initial concentration of the reactant is 0.8 mol L⁻¹ and the rate constant k = 2 × 10⁻³ mol L⁻¹ s⁻¹. The half-life of t...
[Easy]Which statement is correct?...
[Medium]Transition state is best described as:...
[Easy]A catalyst increases rate by:...
[Easy]For 2A + B → Products with rate = k[A]²[B], overall order is:...
[Medium]Characteristic of zero-order reaction:...
[Medium]Which reaction order has half-life independent of initial concentration?...
[Easy]Half-life (t1/2) of a first-order reaction depends on:...
[Easy]Collision theory requires effective collisions have:...
[Medium]Hydrolysis of ester in large excess water shows pseudo first-order because:...
[Easy]For reaction: A → Products, rate expression in terms of A is:...
[Easy]In a two-step mechanism, the rate-determining step is the one with:...
[Medium]Half-life for second-order (A → products) with rate = k[A]² is:...
[Easy]Integrated first-order rate law (A → products) is:...
[Easy]Arrhenius equation expresses k as:...
[Easy]Lower activation energy implies:...