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Numerical

JEE Main 2024 (Online) 1st February Evening Shift
The following data were obtained during the first order thermal decomposition of a gas A at constant volume : $\mathrm{A}(\mathrm{g}) \rightarrow 2 \m...
JEE Main 2024 (Online) 1st February Morning Shift
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} ...
JEE Main 2024 (Online) 31st January Evening Shift
$$\mathrm{r}=\mathrm{k}[\mathrm{A}]$$ for a reaction, $$50 \%$$ of $$\mathrm{A}$$ is decomposed in 120 minutes. The time taken for $$90 \%$$ decomposi...
JEE Main 2024 (Online) 30th January Evening Shift
$$\mathrm{NO}_2$$ required for a reaction is produced by decomposition of $$\mathrm{N}_2 \mathrm{O}_5$$ in $$\mathrm{CCl}_4$$ as by equation $$2 \math...
JEE Main 2024 (Online) 30th January Morning Shift
The rate of First order reaction is $$0.04 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$ at 10 minutes and $$0.03 \mathrm{~mol} \mathrm{~L}^{-1} \...
JEE Main 2024 (Online) 29th January Evening Shift
The half-life of radioisotope bromine - 82 is 36 hours. The fraction which remains after one day is ________ $$\times 10^{-2}$$. (Given antilog $$0.20...
JEE Main 2024 (Online) 29th January Morning Shift
For a reaction taking place in three steps at same temperature, overall rate constant $$\mathrm{K}=\frac{\mathrm{K}_1 \mathrm{~K}_2}{\mathrm{~K}_3}$$....
JEE Main 2024 (Online) 27th January Evening Shift
Time required for completion of $$99.9 \%$$ of a First order reaction is ________ times of half life $$\left(t_{1 / 2}\right)$$ of the reaction....
JEE Main 2024 (Online) 27th January Morning Shift
Consider the following data for the given reaction $$2 \mathrm{HI}_{(\mathrm{g})} \rightarrow \mathrm{H}_{2(\mathrm{~g})}+\mathrm{I}_{2(\mathrm{~g})}$...
JEE Main 2023 (Online) 15th April Morning Shift
For a reversible reaction $\mathrm{A} \rightleftharpoons \mathrm{B}$, the $\Delta \mathrm{H}_{\text{forward reaction}} = 20 \mathrm{~kJ} \mathrm{~mol}...
JEE Main 2023 (Online) 13th April Evening Shift
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 ...
JEE Main 2023 (Online) 13th April Morning Shift
$$\mathrm{t}_{87.5}$$ is the time required for the reaction to undergo $$87.5 \%$$ completion and $$\mathrm{t}_{50}$$ is the time required for the rea...
JEE Main 2023 (Online) 12th April Morning Shift
The reaction $$2 \mathrm{NO}+\mathrm{Br}_{2} \rightarrow 2 \mathrm{NOBr}$$ takes places through the mechanism given below: $$\mathrm{NO}+\mathrm{Br}_{...
JEE Main 2023 (Online) 11th April Morning Shift
$$\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 ...
JEE Main 2023 (Online) 10th April Evening Shift
The number of incorrect statement/s from the following is ___________ A. The successive half lives of zero order reactions decreases with time. B. A s...
JEE Main 2023 (Online) 10th April Morning Shift
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 ...
JEE Main 2023 (Online) 8th April Morning Shift
The number of given statement/s which is/are correct is __________. (A) The stronger the temperature dependence of the rate constant, the higher is th...
JEE Main 2023 (Online) 1st February Evening Shift
$$\mathrm{A}$$ $$\rightarrow \mathrm{B}$$ The above reaction is of zero order. Half life of this reaction is $$50 \mathrm{~min}$$. The time taken for ...
JEE Main 2023 (Online) 1st February Morning Shift
A and B are two substances undergoing radioactive decay in a container. The half life of A is 15 min and that of B is 5 min. If the initial concentrat...
JEE Main 2023 (Online) 31st January Evening Shift
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 ...
JEE Main 2023 (Online) 31st January Morning Shift
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 energ...
JEE Main 2023 (Online) 30th January Evening Shift
An organic compound undergoes first-order decomposition. If the time taken for the $60 \%$ decomposition is $540 \mathrm{~s}$, then the time required ...
JEE Main 2023 (Online) 30th January Morning Shift
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 $$\mathrm{A...
JEE Main 2023 (Online) 29th January Evening Shift
For conversion of compound A $$\to$$ B, the rate constant of the reaction was found to be $$\mathrm{4.6\times10^{-5}~L~mol^{-1}~s^{-1}}$$. The order o...
JEE Main 2023 (Online) 29th January Morning Shift
For certain chemical reaction $$X\to Y$$, the rate of formation of product is plotted against the time as shown in the figure. The number of $$\mathrm...
JEE Main 2023 (Online) 25th January Evening Shift
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 ____...
JEE Main 2023 (Online) 25th January Morning Shift
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 intege...
JEE Main 2023 (Online) 24th January Morning Shift
The number of correct statement/s from the following is __________ A. Larger the activation energy, smaller is the value of the rate constant. B. The ...
JEE Main 2022 (Online) 29th July Evening Shift
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 i...
JEE Main 2022 (Online) 29th July Morning Shift
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...
JEE Main 2022 (Online) 28th July Evening Shift
For a reaction, given below is the graph of $$\ln k$$ vs $${1 \over T}$$. The activation energy for the reaction is equal to ____________ $$\mathrm{ca...
JEE Main 2022 (Online) 28th July Morning Shift
For the given first order reaction $$\mathrm{A} \rightarrow \mathrm{B}$$ the half life of the reaction is $$0.3010 \mathrm{~min}$$. The ratio of the i...
JEE Main 2022 (Online) 27th July Evening Shift
$$\matrix{ {[A]} & \to & {[B]} \cr {{\mathop{\rm Reactant}\nolimits} } & {} & {{\mathop{\rm Product}\nolimits} } \cr } $$ If formation o...
JEE Main 2022 (Online) 27th July Morning Shift
$$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...
JEE Main 2022 (Online) 26th July Morning Shift
For a reaction $$\mathrm{A} \rightarrow 2 \mathrm{~B}+\mathrm{C}$$ the half lives are $$100 \mathrm{~s}$$ and $$50 \mathrm{~s}$$ when the concentratio...
JEE Main 2022 (Online) 25th July Evening Shift
For the decomposition of azomethane. CH3N2CH3(g) $$\to$$ CH3CH3(g) + N2(g), a first order reaction, the variation in partial pressure with time at 600...
JEE Main 2022 (Online) 25th July Morning Shift
The half life for the decomposition of gaseous compound $$\mathrm{A}$$ is $$240 \mathrm{~s}$$ when the gaseous pressure was 500 Torr initially. When t...
JEE Main 2022 (Online) 30th June Morning Shift
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 respectivel...
JEE Main 2022 (Online) 29th June Evening Shift
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...
JEE Main 2022 (Online) 29th June Morning Shift
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 chan...
JEE Main 2022 (Online) 28th June Evening Shift
A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is ___________. (Nearest integer) (Give...
JEE Main 2022 (Online) 28th June Morning Shift
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...
JEE Main 2022 (Online) 27th June Evening Shift
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 ...
JEE Main 2022 (Online) 27th June Morning Shift
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...
JEE Main 2022 (Online) 26th June Evening Shift
Catalyst A reduces the activation energy for a reaction by 10 kJ mol$$-$$1 at 300 K. The ratio of rate constants, $${{{}^kT,\,Catalysed} \over {{}^kT,...
JEE Main 2022 (Online) 26th June Morning Shift
A flask is filled with equal moles of A and B. The half lives of A and B are 100 s and 50 s respectively and are independent of the initial concentrat...
JEE Main 2022 (Online) 25th June Evening Shift
At 345 K, the half life for the decomposition of a sample of a gaseous compound initially at 55.5 kPa was 340 s. When the pressure was 27.8 kPa, the h...
JEE Main 2022 (Online) 25th June Morning Shift
For a given chemical reaction $$\gamma$$1A + $$\gamma$$2B $$\to$$ $$\gamma$$3C + $$\gamma$$4D Concentration of C changes from 10 mmol dm$$-$$3 to 20 m...
JEE Main 2022 (Online) 24th June Morning Shift
The rate constants for decomposition of acetaldehyde have been measured over the temperature range 700 - 1000 K. The data has been analysed by plottin...
JEE Main 2021 (Online) 31st August Evening Shift
For the reaction A $$\to$$ B, the rate constant k(in s$$-$$1) is given by$${\log _{10}}k = 20.35 - {{(2.47 \times {{10}^3})} \over T}$$The energy of a...
JEE Main 2021 (Online) 31st August Morning Shift
For a first order reaction, the ratio of the time for 75% completion of a reaction to the time for 50% completion is ____________. (Integer answer)
JEE Main 2021 (Online) 31st August Morning Shift
According to the following figure, the magnitude of the enthalpy change of the reactionA + B $$\to$$ M + N in kJ mol$$-$$ is equal to ___________. (In...
JEE Main 2021 (Online) 27th August Evening Shift
The first order rate constant for the decomposition of CaCO3 at 700 K is 6.36 $$\times$$ 10$$-$$3s$$-$$1 and activation energy is 209 kJ mol$$-$$1. It...
JEE Main 2021 (Online) 27th August Morning Shift
The reaction that occurs in a breath analyser, a device used to determine the alcohol level in a person's blood stream is $$2{K_2}C{r_2}{O_7} + 8{H_2}...
JEE Main 2021 (Online) 26th August Morning Shift
The following data was obtained for chemical reaction given below at 975 K.2NO(g) + 2H2(g) $$\to$$ N2(g) + 2H2O(g)The order of the reaction with respe...
JEE Main 2021 (Online) 27th July Evening Shift
For the first order reaction A $$\to$$ 2B, 1 mole of reactant A gives 0.2 moles of B after 100 minutes. The half life of the reaction is __________ mi...
JEE Main 2021 (Online) 25th July Evening Shift
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 i...
JEE Main 2021 (Online) 22th July Evening Shift
$${N_2}{O_{5(g)}} \to 2N{O_{2(g)}} + {1 \over 2}{O_{2(g)}}$$In the above first order reaction the initial concentration of N2O5 is 2.40 $$\times$$ 10$...
JEE Main 2021 (Online) 20th July Evening Shift
$$PC{l_5}(g) \to PC{l_3}(g) + C{l_2}(g)$$In the above first order reaction the concentration of PCl5 reduces from initial concentration 50 mol L$$-$$1...
JEE Main 2021 (Online) 20th July Morning Shift
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 inacti...
JEE Main 2021 (Online) 18th March Evening Shift
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...
JEE Main 2021 (Online) 18th March Morning Shift
2NO(g) + Cl2(g) $$\rightleftharpoons $$ 2NOCl(s) This reaction was studied at $$-$$10$$^\circ$$ and the following data was obtained Run $$...
JEE Main 2021 (Online) 17th March Evening Shift
The reaction 2A + B2 $$ \to $$ 2AB is an elementary reaction.For a certain quantity of reactants, if the volume of the reaction vessel is reduced by a...
JEE Main 2021 (Online) 17th March Morning Shift
For a certain first order reaction 32% of the reactant is left after 570s. The rate constant of this reaction is _________ $$\times$$ 10$$-$$3 s$$-$$1...
JEE Main 2021 (Online) 16th March Evening Shift
A and B decompose via first order kinetics with half-lives 54.0 min and 18.0 min respectively. Starting from an equimolar non reactive mixture of A an...
JEE Main 2021 (Online) 16th March Morning Shift
The decomposition of formic acid on gold surface follows first order kinetics. If the rate constant at 300 K is 1.0 $$\times$$ 10$$-$$3 s$$-$$1 and th...
JEE Main 2021 (Online) 26th February Evening Shift
If the activation energy of a reaction is 80.9 kJ mol$$-$$1, the fraction of molecules at 700 K, having enough energy to react to form products is e$$...
JEE Main 2021 (Online) 25th February Evening Shift
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...
JEE Main 2021 (Online) 25th February Morning Shift
For the reaction, aA + bB $$ \to $$ cC + dD, the plot of log k vs $${1 \over T}$$ is given below :The temperature at which the rate constant of the re...
JEE Main 2021 (Online) 24th February Evening Shift
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, t...
JEE Main 2021 (Online) 24th February Morning Shift
Gaseous cyclobutene isomerises to butadiene in a first order process which has a 'k' value of 3.3 $$ \times $$ 10-4 s-1 at 153°C. The time in minutes ...
JEE Main 2020 (Online) 6th September Evening Slot
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 reactio...
JEE Main 2020 (Online) 4th September Evening Slot
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. I...
JEE Main 2020 (Online) 4th September Morning Slot
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...
JEE Main 2020 (Online) 9th January Evening Slot
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 t...
JEE Main 2020 (Online) 7th January Morning Slot
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 bor...

MCQ (Single Correct Answer)

JEE Main 2024 (Online) 31st January Morning Shift
Integrated rate law equation for a first order gas phase reaction is given by (where $$\mathrm{P}_{\mathrm{i}}$$ is initial pressure and $$\mathrm{P}_...
JEE Main 2023 (Online) 11th April Evening Shift
For a chemical reaction $$\mathrm{A}+\mathrm{B} \rightarrow$$ Product, the order is 1 with respect to $$\mathrm{A}$$ and $$\mathrm{B}$$. .tg {border...
JEE Main 2023 (Online) 8th April Evening Shift
The correct reaction profile diagram for a positive catalyst reaction.
JEE Main 2023 (Online) 6th April Evening Shift
Consider the following reaction that goes from A to B in three steps as shown below: Choose the correct option...
JEE Main 2023 (Online) 24th January Evening Shift
A student has studied the decomposition of a gas AB$$_3$$ at 25$$^\circ$$C. He obtained the following data. .tg {border-collapse:collapse;border-spa...
JEE Main 2022 (Online) 28th July Morning Shift
For kinetic study of the reaction of iodide ion with $$\mathrm{H}_{2} \mathrm{O}_{2}$$ at room temperature : (A) Always use freshly prepared starch so...
JEE Main 2022 (Online) 26th July Evening Shift
At $$30^{\circ} \mathrm{C}$$, the half life for the decomposition of $$\mathrm{AB}_{2}$$ is $$200 \mathrm{~s}$$ and is independent of the initial conc...
JEE Main 2022 (Online) 24th June Evening Shift
For a first order reaction, the time required for completion of 90% reaction is 'x' times the half life of the reaction. The value of 'x' is (Given : ...
JEE Main 2021 (Online) 1st September Evening Shift
Which one of the following given graphs represents the variation of rate constant (k) with temperature (T) for an endothermic reaction?
JEE Main 2021 (Online) 27th July Morning Shift
For a reaction of order n, the unit of the rate constant is :
JEE Main 2021 (Online) 25th July Morning Shift
For the following graphs,Choose from the options given below, the correct one regarding order of reaction is :...
JEE Main 2021 (Online) 22th July Evening Shift
Isotope(s) of hydrogen which emits low energy $$\beta$$$$-$$ particles with t1/2 value > 12 years is/are
JEE Main 2020 (Online) 6th September Morning Slot
Consider the following reactions A $$ \to $$ P1 ; B $$ \to $$ P2 ; C $$ \to $$ P3 ; D $$ \to $$ P4, The order of the above reactions are a, b, c, and ...
JEE Main 2020 (Online) 5th September Evening Slot
The rate constant (k) of a reaction is measured at differenct temperatures (T), and the data are plotted in the given figure. The activation energy of...
JEE Main 2020 (Online) 5th September Morning Slot
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, res...
JEE Main 2020 (Online) 3rd September Evening Slot
For the reaction 2A + 3B + $${3 \over 2}$$C $$ \to $$ 3P, which statement is correct ?
JEE Main 2020 (Online) 3rd September Morning Slot
It is true that :
JEE Main 2020 (Online) 2nd September Evening Slot
The results given in the below table were obtained during kinetic studies of the following reaction 2A + B $$ \to $$ C + D X and Y in the given table...
JEE Main 2020 (Online) 9th January Morning Slot
For the following reactions $$A\buildrel {700K} \over \longrightarrow {\mathop{\rm Product}\nolimits} $$ $$A\mathrel{\mathop{\kern0pt\longrightarrow}...
JEE Main 2020 (Online) 8th January Evening Slot
Consider the following plots of rate constant versus $${1 \over T}$$ for four different reactions. Which of the following orders is correct for the ac...
JEE Main 2020 (Online) 8th January Morning Slot
The rate of a certain biochemical reaction at physiological temperature (T) occurs 106 times faster with enzyme than without. The change in the activa...
JEE Main 2020 (Online) 7th January Evening Slot
For the reaction 2H2(g) + 2NO(g) $$ \to $$ N2(g) + 2H2O(g) the observed rate expression is, rate = Kf[NO]2[H2]. The rate expression for the reverse re...
JEE Main 2019 (Online) 12th April Evening Slot
NO2 required for a reaction is produced by the decomposition of N2O5 in CCl4 as per the equation, 2N2O5(g) $$ \to $$ 4NO2(g) + O2(g). The initial conc...
JEE Main 2019 (Online) 12th April Morning Slot
In the following reaction; xA $$ \to $$ yB $${\log _{10}}\left[ { - {{d\left[ A \right]} \over {dt}}} \right] = {\log _{10}}\left[ {{{d\left[ B \right...
JEE Main 2019 (Online) 10th April Evening Slot
For the reaction of H2 with I2, the rate constant is 2.5 × 10–4 dm3 mol–1s–1 at 327°C and 1.0 dm3 mol–1 at 527°C. The activation energy for the re...
JEE Main 2019 (Online) 10th April Morning Slot
A bacterial infection in an internal wound grows as N'(t) = N0 exp(t), where the time t is in hours. A does of antibiotic, taken orally, needs 1 hour ...
JEE Main 2019 (Online) 9th April Evening Slot
Consider the given plot of enthalpy of the following reaction between A and B. A+ B $$ \to $$ C + D Identify the incorrect statement. ...
JEE Main 2019 (Online) 9th April Morning Slot
The given plots represent the variation of the concentration of a reactant R with time for two different reactions (i) and (ii). The respective orders...
JEE Main 2019 (Online) 8th April Evening Slot
For a reaction scheme $$A\buildrel {{k_1}} \over \longrightarrow B\buildrel {{k_2}} \over \longrightarrow C$$, if the rate of formation of B is set...
JEE Main 2019 (Online) 8th April Morning Slot
For the reaction 2A + B $$ \to $$ C, the values of initial rate at diffrent reactant concentrations are given in the table below. The rate law for the...
JEE Main 2019 (Online) 12th January Evening Slot
For a reaction consider the plot of $$\ell $$n k versus 1/T given in the figure. If the rate constant of this reaction at 400 K is 10–5 s–1, then the ...
JEE Main 2019 (Online) 12th January Morning Slot
Decomposition of X exhibits a rate constant of 0.05 $$\mu $$g/year. How many year are required for the decomposition of 5$$\mu $$g of X into 2.5 $$\mu...
JEE Main 2019 (Online) 11th January Evening Slot
The reaction 2X $$ \to $$ B is a zeroth order reaction. If the initial concentration of X is 0.2 M, the half-life is 6 h. When the initial concentrati...
JEE Main 2019 (Online) 11th January Morning Slot
If a reaction follows the Arrhenius equation, the plot ln k vs $${1 \over {\left( {RT} \right)}}$$ gives straight line with a gradient ($$-$$ y) unit....
JEE Main 2019 (Online) 10th January Evening Slot
For an elementary chemical reaction, the expression for $${{d\left[ A \right]} \over {dt}}$$ is ...
JEE Main 2019 (Online) 10th January Morning Slot
Consider the given plots for a reaction obeying Arrhenius equation (0oC < T < 300oC) : (K and Ea are rate constant and activation energy, respec...
JEE Main 2019 (Online) 9th January Evening Slot
For the reaction, 2A + B $$ \to $$ products, when the concentrations of A and B both were doubled, the rate of the reaction increased from 0.3 mo...
JEE Main 2019 (Online) 9th January Morning Slot
The following results were obtained during kinetic studies of the reaction ; 2A + B $$ \to $$ Products .tg {border-collapse:collapse;border-sp...
JEE Main 2018 (Online) 16th April Morning Slot
If 50% of a reaction occurs in 100 second and 75% of the reaction occurs in 200 secod, the order of this reaction is :
JEE Main 2018 (Offline)
At 518oC the rate of decomposition of a sample of gaseous acetaldehyde initially at a pressure of 363 Torr, was 1.00 Torr s–1 when 5% had reacted and ...
JEE Main 2018 (Online) 15th April Evening Slot
For a first order reaction, A $$ \to $$ P, t1/2 (half-life) is 10 days The time required for $${1 \over 4}$$th conversion of A (in days) is : (ln 2 = ...
JEE Main 2018 (Online) 15th April Morning Slot
N2O5 decomposes to NO2 and O2 and follows first order kinetics. After 50 minutes, the pressure inside the vessel increases from 50 mmHg to 87.5 mmHg. ...
JEE Main 2017 (Online) 9th April Morning Slot
The rate of a reaction quadruples when the temperature changes from 300 to 310 K. The activation energy of this reaction is : (Assume activation energ...
JEE Main 2017 (Online) 8th April Morning Slot
The rate of a reaction A doubles on increasing the temperature from 300 to 310 K. By how much, the temperature of reaction B should be Increased from ...
JEE Main 2017 (Offline)
Two reactions R1 and R2 have identical pre-exponential factors. Activation energy of R1 exceeds that of R2 by 10 kJ mol–1. If k1 and k2 are rate const...
JEE Main 2016 (Online) 10th April Morning Slot
The rate law for the reaction below is given by the expression k [A] [B] A + B $$ \to $$ Product If the concentration of B is increased from 0.1 to 0....
JEE Main 2016 (Online) 9th April Morning Slot
The reaction of ozone with oxygen atoms in the presence of chlorine atoms can occur by a two step process shown below : O3(g) + Cl$${^ \bullet }$$ (g)...
JEE Main 2016 (Offline)
Decomposition of H2O2 follows a first order reaction. In fifty minutes the concentration of H2O2 decreases from 0.5 to 0.125 M in one such decompositi...
JEE Main 2015 (Offline)
Higher order (>3) reactions are rare due to
JEE Main 2014 (Offline)
For the non – stoichiometre reaction 2A + B $$\to$$ C + D, the following kinetic data were obtained in three separate experiments, all at 298 K. .tg...
JEE Main 2013 (Offline)
The rate of a reaction doubles when its temperature changes from 300K to 310K. Activation energy of such a reaction will be:(R = 8.314 JK–1 mol–1 and ...
AIEEE 2012
For a first order reaction, (A) $$\to$$ products, the concentration of A changes from 0.1 M to 0.025 M in 40 minutes. The rate of reaction when the co...
AIEEE 2011
The rate of a chemical reaction doubles for every 10oC rise of temperature. If the temperature is raised by 50oC , the rate of the reaction increases ...
AIEEE 2010
The time for half life period of a certain reaction A $$\to$$ products is 1 hour. When the initial concentration of the reactant ‘A’, is 2.0 mol L–1, ...
AIEEE 2010
Consider the reaction : Cl2(aq) + H2S(aq) → S(s) + 2H+ (aq) + 2Cl– (aq) The rate equation for this reaction is rate = k [Cl2] [H2S] Which of these mec...
AIEEE 2009
The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be ...
AIEEE 2008
For a reaction $${1 \over 2}A \to 2B$$ rate of disappearance of ‘A’ is related to the rate of appearance of ‘B’ by the expression
AIEEE 2007
The energies of activation for forward and reverse reactions for A2 + B2 $$\leftrightharpoons$$ 2AB are 180 kJ mol−1 and 200 kJ mol−1 respectively. Th...
AIEEE 2007
Consider the reaction, 2A + B $$\to$$ products. When concentration of B alone was doubled, the half-life did not change. When the concentration of A a...
AIEEE 2007
A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity is ten times the permissible val...
AIEEE 2007
Which of the following nuclear reactions will generate an isotope?
AIEEE 2006
A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with...
AIEEE 2006
In the transformation of $${}_{92}^{238}U$$ to $${}_{92}^{234}U$$, if one emission is an α-particle, what should be the other emission(s)?
AIEEE 2006
Rate of a reaction can be expressed by Arrhenius equation as: $$$k = A\,{e^{ - E/RT}}$$$ In this equation, E represents
AIEEE 2006
The following mechanism has been proposed for the reaction of NO with Br2 to form NOBr: NO(g) + Br2 (g) $$\leftrightharpoons$$ NOBr2 (g) NOBr2 (g) ...
AIEEE 2005
Hydrogen bomb is based on the principle of
AIEEE 2005
A reaction involving two different reactants can never be
AIEEE 2005
The photon of hard gamma radiation knocks a proton out of $${}_{12}^{24}Mg$$ nucleus to form
AIEEE 2005
t1/4 can be taken as the time taken for the concentration of a reactant to drop to $$3 \over 4$$ of its initial value. If the rate constant for a firs...
AIEEE 2005
A schematic plot of $$ln$$ $${K_{eq}}$$ versus inverse of temperature for a reaction is shown below The reaction must be ...
AIEEE 2004
In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to chan...
AIEEE 2004
Consider the following nuclear reactions $${}_{92}^{238}M \to {}_Y^XN + 2{}_2^4He$$ $${}_Y^XN \to {}_B^AL + 2{\beta ^ + }$$ The number of neutrons in ...
AIEEE 2004
The rate equation for the reaction 2A + B $$\to$$ C is found to be: rate k[A][B]. The correct statement in relation to this reaction is that the
AIEEE 2004
The half – life of a radioisotope is four hours. If the initial mass of the isotope was 200 g, the mass remaining after 24 hours undecayed is
AIEEE 2003
The radionucleide $${}_{90}^{234}Th$$ undergoes two successive $$\beta$$ -decays followed by one $$\alpha$$-decay. The atomic number and the mass numb...
AIEEE 2003
The half-life of a radioactive isotope is three hours. If the initial mass of the isotope were 256 g, the mass of it remaining undecayed after 18 hour...
AIEEE 2003
In respect of the equation k = Ae-Ea/RT in chemical kinetics, which one of the following statements is correct?
AIEEE 2003
The rate law for a reaction between the substances A and B is given by Rate = k[A]n [B]m On doubling the concentration of A and halving the concentrat...
AIEEE 2003
For the reaction system: 2NO(g) + O2(g) $$\to$$ 2NO2(g) volume is suddenly reduce to half its value by increasing the pressure on it. If the reaction...
AIEEE 2002
Units of rate constant of first and zero order reactions in terms of molarity M unit are respectively
AIEEE 2002
For the reaction A + 2B $$\to$$ C, rate is given by R = [A] [B]2 then the order of the reaction is
AIEEE 2002
The differential rate law for the reaction H2 + I2 $$\to$$ 2HI is
AIEEE 2002
If half-life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is
AIEEE 2002
The integrated rate equation is Rt = log C0 - log Ct . The straight line graph is obtained by plotting
AIEEE 2002
$$\beta$$ - particle is emitted in radioactivity by
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