JEE MAIN · CHEMISTRY · CHEMICAL KINETICS
JEE Main Chemical Kinetics Questions & Solutions
96 solved questions on Chemical Kinetics, ranging from easy to JEE-Advanced-flavour hard. Click any to see the full solution.
96 solved questions on Chemical Kinetics, ranging from easy to JEE-Advanced-flavour hard. Click any to see the full solution.
For a first order reaction, the time required for completion of 90% reaction is 'x' times the half life of the reaction. The value of 'x' is (Given : ln 10 = 2.303 and log 2 =…
View solution →During Kinetic study of reaction $\mathrm{2 A+B \rightarrow C+D}$, the following results were obtained : .tg {border-collapse:collapse;border-spacing:0;} .tg…
View solution →If compound A reacts with B following first order kinetics with rate constant $2.011 \times 10^{-3} \mathrm{~s}^{-1}$. The time taken by $\mathrm{A}$ (in seconds) to reduce from…
View solution →A $\to$ B The rate constants of the above reaction at 200 K and 300 K are 0.03 min$^{-1}$ and 0.05 min$^{-1}$ respectively. The activation energy for the reaction is ___________ J…
View solution →$$2 \mathrm{NO}+2 \mathrm{H}_{2} \rightarrow \mathrm{N}_{2}+2 \mathrm{H}_{2} \mathrm{O}$$ The above reaction has been studied at $800^{\circ} \mathrm{C}$. The related data are…
View solution →For conversion of compound A $\to$ B, the rate constant of the reaction was found to be $\mathrm{4.6\times10^{-5}~L~mol^{-1}~s^{-1}}$. The order of the reaction is ____________.
View solution →For the reaction 2A + 3B + ${3 \over 2}$C $\to$ 3P, which statement is correct ?
View solution →For a reaction of order n, the unit of the rate constant is :
View solution →For a certain first order reaction 32% of the reactant is left after 570s. The rate constant of this reaction is _________ $\times$ 10$-$3 s$-$1. (Round off to the Nearest…
View solution →Integrated rate law equation for a first order gas phase reaction is given by (where $\mathrm{P}_{\mathrm{i}}$ is initial pressure and $\mathrm{P}_{\mathrm{t}}$ is total pressure…
View solution →An organic compound undergoes first-order decomposition. If the time taken for the $60 \%$ decomposition is $540 \mathrm{~s}$, then the time required for $90 \%$ decomposition…
View solution →Time required for completion of $99.9 \%$ of a First order reaction is ________ times of half life $\left(t_{1 / 2}\right)$ of the reaction.
View solution →For a reaction taking place in three steps at same temperature, overall rate constant $\mathrm{K}=\frac{\mathrm{K}_1 \mathrm{~K}_2}{\mathrm{~K}_3}$. If $\mathrm{Ea}_1,…
View solution →A sample of milk splits after 60 min. at 300 K and after 40 min. at 400 K when the population of lactobacillus acidophilus in it doubles. The activa tion energy (in kJ/ mol) for…
View solution →Catalyst A reduces the activation energy for a reaction by 10 kJ mol$-$1 at 300 K. The ratio of rate constants, ${{{}^kT,\,Catalysed} \over {{}^kT,\,Uncatalysed}}$ is ex. The…
View solution →For a chemical reaction A $\to$ B, it was found that concentration of B is increased by 0.2 mol L$-$ in 30 min. The average rate of the reaction is ____________ $\times$ 10$-$1…
View solution →The rate of a reaction decreased by 3.555 times when the temperature was changed from 40oC to 30oC. The activation energy (in kJ mol–1) of the reaction is _______. Take; R =…
View solution →For kinetic study of the reaction of iodide ion with $\mathrm{H}_{2} \mathrm{O}_{2}$ at room temperature : (A) Always use freshly prepared starch solution. (B) Always keep the…
View solution →The reaction that occurs in a breath analyser, a device used to determine the alcohol level in a person's blood stream is $$2{K_2}C{r_2}{O_7} + 8{H_2}S{O_4} + 3{C_2}{H_6}O \to…
View solution →The half life for the decomposition of gaseous compound $\mathrm{A}$ is $240 \mathrm{~s}$ when the gaseous pressure was 500 Torr initially. When the pressure was 250 Torr, the…
View solution →At $30^{\circ} \mathrm{C}$, the half life for the decomposition of $\mathrm{AB}_{2}$ is $200 \mathrm{~s}$ and is independent of the initial concentration of $\mathrm{AB}_{2}$. The…
View solution →A student has studied the decomposition of a gas AB$_3$ at 25$^\circ$C. He obtained the following data. .tg {border-collapse:collapse;border-spacing:0;} .tg…
View solution →The activation energy of one of the reactions in a biochemical process is 532611 J mol$-$1. When the temperature falls from 310 K to 300 K, the change in rate constant observed is…
View solution →Assuming $1 \,\mu \mathrm{g}$ of trace radioactive element X with a half life of 30 years is absorbed by a growing tree. The amount of X remaining in the tree after 100 years is…
View solution →Sucrose hydrolyses in acid solution into glucose and fructose following first order rate law with a half-life of 3.33 h at 25$^\circ$C. After 9 h, the fraction of sucrose…
View solution →The rate constant for a first order reaction is given by the following equation: $\ln k = 33.24 - {{2.0 \times {{10}^4}\,K} \over T}$ The activation energy for the reaction is…
View solution →A and B decompose via first order kinetics with half-lives 54.0 min and 18.0 min respectively. Starting from an equimolar non reactive mixture of A and B, the time taken for the…
View solution →The reaction $A_2 + B_2 \rightarrow 2AB$ follows the mechanism:$A_2 \overset{k_1}{\underset{k_{-1}}{\rightleftharpoons}} A + A$ (fast)$A + B_2 \xrightarrow{k_2} AB + B$ (slow)$A +…
View solution →Consider the following single step reaction in gas phase at constant temperature. $$2 \mathrm{~A}_{(\mathrm{g})}+\mathrm{B}_{(\mathrm{g})} \rightarrow \mathrm{C}_{(\mathrm{g})}$$…
View solution →For a first order reaction A $\to$ B, the rate constant, k = 5.5 $\times$ 10$-$14 s$-$1. The time required for 67% completion of reaction is x $\times$ 10$-$1 times the half life…
View solution →Consider the following reaction $\mathrm{A}+\mathrm{B} \rightarrow \mathrm{C}$ The time taken for A to become $1 / 4^{\text {th }}$ of its initial concentration is twice the time…
View solution →For the reaction A $\to$ B, the rate constant k(in s$-$1) is given by${\log _{10}}k = 20.35 - {{(2.47 \times {{10}^3})} \over T}$The energy of activation in kJ mol$-$1 is…
View solution →Rate law for a reaction between $A$ and $B$ is given by $\mathrm{r}=\mathrm{k}[\mathrm{~A}]^{\mathrm{n}}[\mathrm{~B}]^{\mathrm{m}}$ If concentration of $A$ is doubled and…
View solution →Time required for $99.9 \%$ completion of a first order reaction is _________ times the time required for completion of $90 \%$ reaction.(nearest integer)
View solution →The ratio of $\frac{{ }^{14} \mathrm{C}}{{ }^{12} \mathrm{C}}$ in a piece of wood is $\frac{1}{8}$ part that of atmosphere. If half life of ${ }^{14} \mathrm{C}$ is 5730 years,…
View solution →The number of incorrect statement/s from the following is ___________ A. The successive half lives of zero order reactions decreases with time. B. A substance appearing as…
View solution →For the first order reaction A $\to$ B, the half life is 30 min. The time taken for 75% completion of the reaction is _________ min. (Nearest integer) Given : log 2 = 0.3010 log 3…
View solution →The decomposition of formic acid on gold surface follows first order kinetics. If the rate constant at 300 K is 1.0 $\times$ 10$-$3 s$-$1 and the activation energy Ea = 11.488 kJ…
View solution →Consider the following first order gas phase reaction at constant temperature $$ \mathrm{A}(\mathrm{g}) \rightarrow 2 \mathrm{B}(\mathrm{~g})+\mathrm{C}(\mathrm{g})$$ If the total…
View solution →2NO(g) + Cl2(g) $\rightleftharpoons$ 2NOCl(s) This reaction was studied at $-$10$^\circ$ and the following data was obtained Run ${[NO]_0}$ ${[C{l_2}]_0}$ ${r_0}$ 1 0.10 0.10 0.18…
View solution →If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed in approximately (in minutes) _______. (Take : log 2 = 0.30; log 2.5 =…
View solution →Consider the following reaction, the rate expression of which is given below $$\begin{aligned} & \mathrm{A}+\mathrm{B} \rightarrow \mathrm{C} \\ & \text { rate…
View solution →For a reaction $\mathrm{A} \rightarrow 2 \mathrm{~B}+\mathrm{C}$ the half lives are $100 \mathrm{~s}$ and $50 \mathrm{~s}$ when the concentration of reactant $\mathrm{A}$ is $0.5$…
View solution →${N_2}{O_{5(g)}} \to 2N{O_{2(g)}} + {1 \over 2}{O_{2(g)}}$In the above first order reaction the initial concentration of N2O5 is 2.40 $\times$ 10$-$2 mol L$-$1 at 318 K. The…
View solution →In a first order decomposition reaction, the time taken for the decomposition of reactant to one fourth and one eighth of its initial concentration are $t_1$ and $t_2$ (s),…
View solution →The reaction 2A + B2 $\to$ 2AB is an elementary reaction.For a certain quantity of reactants, if the volume of the reaction vessel is reduced by a factor of 3, the rate of the…
View solution →For a given chemical reaction $\gamma$1A + $\gamma$2B $\to$ $\gamma$3C + $\gamma$4D Concentration of C changes from 10 mmol dm$-$3 to 20 mmol dm$-$3 in 10 seconds. Rate of…
View solution →A flask contains a mixture of compounds A and B. Both compounds decompose by first-order kinetics. The half-lives for A and B are 300 s and 180 s, respectively. If the…
View solution →Consider the following statements related to temperature dependence of rate constants. Identify the correct statements. A. The Arrhenius equation holds true only for an elementary…
View solution →For the following reactions $A\buildrel {700K} \over \longrightarrow {\mathop{\rm Product}\nolimits}$ $$A\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{catalyst}^{500K}}…
View solution →$PC{l_5}(g) \to PC{l_3}(g) + C{l_2}(g)$In the above first order reaction the concentration of PCl5 reduces from initial concentration 50 mol L$-$1 to 10 mol L$-$1 in 120 minutes…
View solution →$\mathrm{t}_{87.5}$ is the time required for the reaction to undergo $87.5 \%$ completion and $\mathrm{t}_{50}$ is the time required for the reaction to undergo $50 \%$…
View solution →$$\mathrm{KClO}_{3}+6 \mathrm{FeSO}_{4}+3 \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{KCl}+3 \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}+3 \mathrm{H}_{2} \mathrm{O}$$…
View solution →For a first order reaction, the ratio of the time for 75% completion of a reaction to the time for 50% completion is ____________. (Integer answer)
View solution →For a chemical reaction $\mathrm{A}+\mathrm{B} \rightarrow$ Product, the order is 1 with respect to $\mathrm{A}$ and $\mathrm{B}$. .tg {border-collapse:collapse;border-spacing:0;}…
View solution →A(g) $\to$ 2B(g) + C(g) is a first order reaction. The initial pressure of the system was found to be 800 mm Hg which increased to 1600 mm Hg after 10 min. The total pressure of…
View solution →For the reaction 2H2(g) + 2NO(g) $\to$ N2(g) + 2H2O(g) the observed rate expression is, rate = Kf[NO]2[H2]. The rate expression for the reverse reaction is :
View solution →$\mathrm{r}=\mathrm{k}[\mathrm{A}]$ for a reaction, $50 \%$ of $\mathrm{A}$ is decomposed in 120 minutes. The time taken for $90 \%$ decomposition of $\mathrm{A}$ is _________…
View solution →A first order reaction has the rate constant, $\mathrm{k=4.6\times10^{-3}~s^{-1}}$. The number of correct statement/s from the following is/are __________ Given :…
View solution →The rate constant for a first order reaction is $20 \mathrm{~min}^{-1}$. The time required for the initial concentration of the reactant to reduce to its $\frac{1}{32}$ level is…
View solution →For the reaction P $\to$ B, the values of frequency factor A and activation energy EA are 4 $\times$ 1013 s$-$1 and 8.3 kJ mol$-$1 respectively. If the reaction is of first order,…
View solution →It has been found that for a chemical reaction with rise in temperature by 9 K the rate constant gets doubled. Assuming a reaction to be occurring at 300 K, the value of…
View solution →Drug $X$ becomes ineffective after $50 \%$ decomposition. The original concentration of drug in a bottle was $16 \mathrm{mg} / \mathrm{mL}$ which becomes $4 \mathrm{mg} /…
View solution →$\mathrm{NO}_2$ required for a reaction is produced by decomposition of $\mathrm{N}_2 \mathrm{O}_5$ in $\mathrm{CCl}_4$ as by equation $$2 \mathrm{~N}_2…
View solution →The reaction $2 \mathrm{NO}+\mathrm{Br}_{2} \rightarrow 2 \mathrm{NOBr}$ takes places through the mechanism given below: $\mathrm{NO}+\mathrm{Br}_{2} \Leftrightarrow…
View solution →For a reaction $A \xrightarrow{\mathrm{K}_1} \mathrm{~B} \xrightarrow{\mathrm{K}_2} \mathrm{C}$ If the rate of formation of B is set to be zero then the concentration of B is…
View solution →If the activation energy of a reaction is 80.9 kJ mol$-$1, the fraction of molecules at 700 K, having enough energy to react to form products is e$-$x. The value of x is…
View solution →The equation k = (6.5 $\times$ 1012s$-$1)e$-$26000K/T is followed for the decomposition of compound A. The activation energy for the reaction is ________ kJ mol$-$1. [nearest…
View solution →For a reversible reaction $\mathrm{A} \rightleftharpoons \mathrm{B}$, the $\Delta \mathrm{H}_{\text{forward reaction}} = 20 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The activation energy…
View solution →The half-life of radioisotope bromine - 82 is 36 hours. The fraction which remains after one day is ________ $\times 10^{-2}$. (Given antilog $0.2006=1.587$)
View solution →Isotope(s) of hydrogen which emits low energy $\beta$$-$ particles with t1/2 value > 12 years is/are
View solution →The first order rate constant for the decomposition of CaCO3 at 700 K is 6.36 $\times$ 10$-$3s$-$1 and activation energy is 209 kJ mol$-$1. Its rate constant (in s$-$1) at 600 K…
View solution →A molecule undergoes two independent first order reactions whose respective half lives are 12 min and 3 min. If both the reactions are occurring then the time taken for the 50%…
View solution →The inactivation rate of a viral preparation is proportional to the amount of virus. In the first minute after preparation, 10% of the virus is inactivated. The rate constant for…
View solution →Consider the two different first order reactions given below $$\begin{aligned} & \mathrm{A}+\mathrm{B} \rightarrow \mathrm{C} \text { (Reaction 1) } \\ & \mathrm{P} \rightarrow…
View solution →The rate constant of a reaction increases by five times on increase in temperature from 27$^\circ$C to 52$^\circ$C. The value of activation energy in kJ mol$-$1 is _________.…
View solution →The number of molecules with energy greater than the threshold energy for a reaction increases five fold by a rise of temperature from 27oC to 42oC. Its energy of activation in…
View solution →The rate of a certain biochemical reaction at physiological temperature (T) occurs 106 times faster with enzyme than without. The change in the activation energy upon adding…
View solution →A reaction has a half life of 1 min. The time required for 99.9% completion of the reaction is _________ min. (Round off to the Nearest Integer). [Use : ln 2 = 0.69; ln 10 = 2.3]
View solution →The rate of First order reaction is $0.04 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$ at 10 minutes and $0.03 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$ at 20 minutes…
View solution →$$\matrix{ {[A]} & \to & {[B]} \cr {{\mathop{\rm Reactant}\nolimits} } & {} & {{\mathop{\rm Product}\nolimits} } \cr } $$ If formation of compound $[\mathrm{B}]$ follows the first…
View solution →During the nuclear explosion, one of the products is 90Sr with half life of 6.93 years. If 1 $\mu$ g of 90Sr was absorbed in the bones of newly born baby in placed of Ca, how much…
View solution →For the given first order reaction $\mathrm{A} \rightarrow \mathrm{B}$ the half life of the reaction is $0.3010 \mathrm{~min}$. The ratio of the initial concentration of reactant…
View solution →The reaction between X and Y is first order with respect to X and zero order with respect to Y. .tg {border-collapse:collapse;border-spacing:0;} .tg…
View solution →At 345 K, the half life for the decomposition of a sample of a gaseous compound initially at 55.5 kPa was 340 s. When the pressure was 27.8 kPa, the half life was found to be 170…
View solution →A flask is filled with equal moles of A and B. The half lives of A and B are 100 s and 50 s respectively and are independent of the initial concentration. The time required for…
View solution →A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is ___________. (Nearest integer) (Given : antilog 0.125 = 1.333,…
View solution →The number of given statement/s which is/are correct is __________. (A) The stronger the temperature dependence of the rate constant, the higher is the activation energy. (B) If a…
View solution →$\mathrm{A \rightarrow B}$ The molecule A changes into its isomeric form B by following a first order kinetics at a temperature of 1000 K . If the energy barrier with respect to…
View solution →Consider a complex reaction taking place in three steps with rate constants $\mathrm{k}_1, \mathrm{k}_2$ and $\mathrm{k}_3$ respectively. The overall rate constant $k$ is given by…
View solution →It is true that :
View solution →Which of the following statement is not true for radioactive decay?
View solution →Consider an elementary reaction $$ \mathrm{A}(\mathrm{~g})+\mathrm{B}(\mathrm{~g}) \rightarrow \mathrm{C}(\mathrm{~g})+\mathrm{D}(\mathrm{~g}) $$ If the volume of reaction mixture…
View solution →In a reaction $A+B \rightarrow C$, initial concentrations of $A$ and $B$ are related as $[A]_0=8[B]_0$. The half lives of $A$ and $B$ are 10 min and 40 min , respectively. If they…
View solution →For $\mathrm{A}_2+\mathrm{B}_2 \rightleftharpoons 2 \mathrm{AB}$ $\mathrm{E}_{\mathrm{a}}$ for forward and backward reaction are 180 and $200 \mathrm{~kJ} \mathrm{~mol}^{-1}$…
View solution →Half life of zero order reaction $\mathrm{A} \rightarrow$ product is 1 hour, when initial concentration of reactant is $2.0 \mathrm{~mol} \mathrm{~L}{ }^{-1}$. The time required…
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