Q JEE MAIN 2026

Decomposition of a hydrocarbon follows the equation $\mathrm{k}=\left(5.5 \times 10^{11} \mathrm{~s}^{-1}\right) \mathrm{e}^{\frac{-28000 \mathrm{~K}}{\mathrm{~T}}}$. The activation energy of reaction is $\_\_\_\_$...

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Sucrose hydrolyses in acidic medium into glucose and fructose by first order rate law with $t_{1 / 2}=3$ hour. The...

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Given below are two statements :

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For a reaction $\mathrm{A} \rightarrow \mathrm{P}$ at TK , the half life $\left(\mathrm{t}_{1 / 2}\right)$ is plotted as a function...

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If the half life of a first order reaction is 6.93 minutes then the time required for completion of $...

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First order gas phase reaction $$ \mathrm{A} \rightarrow \mathrm{~B}+\mathrm{C} $$ $p_i=$ initial pressure of gas $\mathrm{A}, p_t=$ total pressure of...

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Q JEE MAIN_2026

For a first order reaction $\mathrm{A} \rightarrow \mathrm{B}$ $x=$ $\_\_\_\_$ min. (Nearest integer)

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An electrochemical cell, consist of the following two redox couples, $\mathrm{M}^{x+}(\mathrm{aq}) / \mathrm{M}(\mathrm{s})\left[\mathrm{E}_{\text {red }}^{\ominus}=+0.15 \mathrm{~V}\right]$ and $...

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Consider the given graph showing variation of reactant concentration with time. Three different reactions were started with identical initial concentration...

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Consider the first order reaction $\mathrm{R} \rightarrow \mathrm{P}$. The fraction of molecules decomposed in the given first order reaction can...

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Consider the following gas phase reaction being carried out in a closed vessel at $25^{\circ} \mathrm{C}$. The pressure of $\mathrm{C}(\mathrm{g})$...

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Q JEE MAIN_2026

Consider the reaction $\mathrm{aX} \rightarrow \mathrm{bY}$, for which the rate constant at $30^{\circ} \mathrm{C}$ is $1 \times 10^{-3} \mathrm{~mol}^{-1} \mathrm{Ls}^{-1}$....

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For reaction $\mathrm{A} \rightarrow \mathrm{P}$, rate constant $\mathrm{k}=1.5 \times 10^3 \mathrm{~s}^{-1}$ at $27^{\circ} \mathrm{C}$ If activation energy for the above...

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Q JEE Main 2026

$t_{100 \%}$ is the time required for the $100 \%$ completion of the reaction while $t_{1 / 2}$ is the...

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An organic compound undergoes first order decomposition. The time taken for decomposition to $\left(\frac{1}{8}\right)^{\text {th }}$ and $\left(\frac{1}{10}\right)^{\text {th }}$...

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A chromium complex with a formula $\mathrm{CrCl}_3 \cdot 6 \mathrm{H}_2 \mathrm{O}$ has a spin only magnetic moment value of 3.87...

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The half-life of ${ }^{65} \mathrm{Zn}$ is 245 days. After $x$ days, $75 \%$ of original activity remained. The value...

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$A \longrightarrow B$ (first reaction) $\mathrm{C} \longrightarrow \mathrm{D}$ (second reaction) Consider the above two first-order reactions. The rate constant for...

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At $27^{\circ} \mathrm{C}$ in presence of a catalyst, activation energy of a reaction is lowered by $10 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The...

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$\mathrm{A} \rightarrow \mathrm{D}$ is an endothermic reaction occurring in three steps (elementary). (i) $\mathrm{A} \rightarrow \mathrm{B} \Delta \mathrm{H}_i=+\mathrm{ve}$ (ii) $...

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Q JEE MAIN 2026

Observe the following reactions at $\mathrm{T}(\mathrm{K})$. I. A → products. II. $5 \mathrm{Br}^{-}(\mathrm{aq})+\mathrm{BrO}_3^{-}(\mathrm{aq})+6 \mathrm{H}^{+}(\mathrm{aq}) \rightarrow 3 \mathrm{Br}_2(\mathrm{aq})+3 \mathrm{H}_2 \mathrm{O}(\mathrm{l})$ Both...

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For the thermal decomposition of reaction AB(g), the following is constructed. The half life of the reaction is ' $x$...

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Given above is the concentration vs time plot for a dissociation reaction : $\mathrm{A} \rightarrow \mathrm{nB}$ Based on the data...

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Consider $A \xrightarrow{k_1} B$ and $C \xrightarrow{k_2} D$ are two reactions. If the rate constant $\left(k_1\right)$ of the $...

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Decomposition of A is a first order reaction at $\mathrm{T}(\mathrm{K})$ and is given by $\mathrm{A}(\mathrm{g}) \longrightarrow \mathrm{B}(\mathrm{g})+\mathrm{C}(\mathrm{g})$. In a closed...

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$\mathrm{A} \rightarrow$ product (First order reaction). Three sets of experiment were performed for a reaction under similar experimental conditions: Run...

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Pre-exponential factors of two different reactions of same order are identical. Let activation energy of first reaction exceeds the activation...

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Q JEE MAIN 2019

For the reaction, $2 \mathrm{~A}+\mathrm{B} \rightarrow$ products, when the concentration of A and B both were doubled, the rate of...

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The results given in the below table were obtained during kinetic studies of the following reaction $2 A+B \rightarrow C+D$...

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Consider the reaction sequence given below: Which of the following statements is true?

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$\mathrm{NO}_2$ required for a reaction is produced by the decomposition of $\mathrm{N}_2 \mathrm{O}_5$ in $\mathrm{CCl}_4$ as per the equation, $...

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Q JEE MAIN 2019

For the reaction, $2 A+B \rightarrow$ products, when the concentration of $A$ and $B$ both were doubled, the rate of...

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Decomposition of X exhibits a rate constant of 0.05 g/year. How many years are required for the decomposition of 5...

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The given plots represent the variation of the concentration of a reactant R with time for two different reactions (i)...

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If the standard electrode potential for a cell is 2 V at 300 K , the equilibrium constant $(\mathrm{K})$ for...

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Consider the following reversible chemical reactions $...

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If the standard electrode potential for a cell is 2 V at 300 K , the equilibrium constant $(\mathrm{K})$ for...

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A flask contains a mixture of compounds A and B. Both compounds decompose by first-order kinetics. The half-lives for A...

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Q JEE MAIN 2019

Consider the following reversible chemical reactions

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For a reaction, consider the plot of $\ln \mathrm{k}$ versus $1 / \mathrm{T}$ given in the figure. If the rate...

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For following reactions $...

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If a reaction follows the Arrhenius equation, the plot $\operatorname{lnk} v s \frac{1}{(R T)}$ gives straight line with a gradient...

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The rate of a certain biochemical reaction at physiological temperature (T) occurs 106 times faster with enzyme than without. The...

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For the reaction of $\mathrm{H}_2$ with $\mathrm{I}_2$, the rate constant is $2.5 \times 10^{-4} \mathrm{dm} 3 \mathrm{~mol}^{-1} \mathrm{~s}^{-1}$ at $...

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If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed...

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Consider the given plots for a reaction obeying Arrhenius equation $\left(0^{\circ} \mathrm{C}

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A sample of milk splits after 60 min. at 300 K and after 40 min. at 400 K when the...

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The reaction $2 X \rightarrow B$ is a zeroth order reaction. If the initial concentration of $X$ is $0.2 M$,...

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Consider the following plots of rate constant versus $\frac{1}{\top}$ for four different reactions. Which of the following orders is correct...

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During the nuclear explosion, one of the products is ${ }^{90} \mathrm{Sr}$ with half life of 6.93 years. If $...

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The reaction rate for the reaction| $$ \left[\mathrm{PtCl}_4\right]^{2-}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons\left[\mathrm{Pt}\left(\mathrm{H}_2 \mathrm{O}\right) \mathrm{Cl}_3\right]^{-}+\mathrm{Cl}^{-} $$ was measured as a function of concentrations...

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SECTION-B The first order rate constant for the decomposition of $\mathrm{CaCO}_3$ at 700 K is $6.36 \times 10^{-3} \mathrm{~s}^{-1}$ and...

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For the reaction $\mathrm{A} \rightarrow \mathrm{B}$, the rate constant $\mathrm{k}\left(\right.$ in $\left.\mathrm{s}^{-1}\right)$ is given by $$ \log _{10} k=20.35-\frac{\left(2.47 \times...

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In the above first order reaction the initial concentration of $\mathrm{N}_2 \mathrm{O}_5$ is $2.40 \times 10^{-2} \mathrm{~mol} \mathrm{~L}^{-1}$ at 318...

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Q JEE MAIN 2021

The following data was obtained for chemical reaction given below at 975 K . $...

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For an elementary chemical reaction, $A_2 \underset{k_{-1}}{\stackrel{k_1}{\rightleftharpoons}} 2 A$, the expression for $\frac{d[A]}{d t}$ is :

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For the first order reaction $A \rightarrow 2 B, 1$ mole of reactlant $A$ gives 0.2 moles of $B$ after...

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The reaction that occurs in a breath analyser, a device used to determine the alcohol level in a person's blood...

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According to the following figure, the magnitude of the enthalpy change of the reaction $\mathrm{A}+\mathrm{B} \rightarrow \mathrm{M}+\mathrm{N}$ in $\mathrm{kJ} \mathrm{mol}^{-1}$...

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Q JEE MAIN 2021

For a first order reaction, the ratio of the time for 75% completion of a reaction to the time for...

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Which one of the following given graphs represents the variation of rate constant (k) with temperature (T) for an endothermic...

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Q JEE MAIN 2021

Which one of the following given graphs represents the variation of rate constant (k) with temperature (T) for an endothermic...

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For a chemical reaction $\mathrm{A} \rightarrow \mathrm{B}$, it was found that concentration of B is increased by $0.2 \mathrm{~mol} \mathrm{~L}^{-1}$...

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The inactivation rate of a viral preparation is proportional to the amount of virus. In the first minute after preparation,...

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$\mathrm{PCl}_5(\mathrm{~g}) \rightarrow \mathrm{PCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g})$ In the above first order reaction the concentration of $\mathrm{PCl}_5$ reduces from initial concentration $50 \mathrm{~mol} \mathrm{~L}^{-1}$...

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Q JEE MAIN 2021

For the following graphs, Choose from the options given below, the correct one regarding order of reaction is :

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Q JEE MAIN 2021

For a reaction of order n, the unit of the rate constant is :

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For a reaction scheme $A \xrightarrow{k_1} B \xrightarrow{k_2} C$, if the rate of formation of $B$ is set to be...

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Q JEE-MAIN 2021

The reaction 2A + $\mathrm{B}_2$ 2AB is an elementary reaction. For a certain quantity of reactants, if the volume of...

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Q JEE MAIN 2021

A reaction has a half life of 1 min. The time required for 99.9% completion of the reaction is ______...

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The rate constant of a reaction increases by five times on increase in temperature from $27^{\circ} \mathrm{C}$ to $52^{\circ} \mathrm{C}$....

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For a certain first order reaction 32\% of the reactant is left after 570 s . The rate constant of...

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The following results were obtained during kinetic studies of the reaction ; $2 \mathrm{~A}+\mathrm{B} \rightarrow$ Products The time (in minutes)...

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A and B decompose via first order kinetics with half-lives 54.0 min and 18.0 min respectively. Starting from an equimolar...

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$2 \mathrm{NO}(\mathrm{g})+\mathrm{Cl}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NOCl}(\mathrm{s})$ This reaction was studied at $-10^{\circ} \mathrm{C}$ and the following data was obtained $[\mathrm{NO}]_0$ and...

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If the activation energy of a reaction is $80.9 \mathrm{~kJ} \mathrm{~mol}^{-1}$, the fraction of molecules at 700 K , having...

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A ball weighing 10 g is moving with a velocity of $90 \mathrm{~ms}^{-1}$. If the uncertainty in its velocity is...

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Q JEE MAIN 2021

The decomposition of formic acid on gold surface follows first order kinetics. If the rate constant at 300 K is...

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Gaseous cyclobutene isomerizes to butadiene in a first order process which has a ' k ' value of $...

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An exothermic reaction $X \rightarrow Y$ has an activation energy $30 \mathrm{~kJ} \mathrm{~mol}^{-1}$. If energy change $\Delta \mathrm{E}$ during the...

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For the reaction, $\mathrm{aA}+\mathrm{bB} \rightarrow \mathrm{cC}+\mathrm{dD}$, the plot of $\log \mathrm{k}$ vs $\frac{1}{\mathrm{~T}}$ is given below : The temperature at...

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Q JEE MAIN 2022

At $30^{\circ} \mathrm{C}$, the half life for the decomposition of $\mathrm{AB}_2$ is 200 s and is independent of the initial...

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Assuming $1 \mu \mathrm{~g}$ of trace radioactive element X with a half life of 30 years is absorbed by a...

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For the given first order reaction $$ A \rightarrow B $$ the half life of the reaction is 0.3010 min...

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For the decomposition of azomethane. $\mathrm{CH}_3 \mathrm{~N}_2 \mathrm{CH}_3(\mathrm{~g}) \rightarrow \mathrm{CH}_3 \mathrm{CH}_3(\mathrm{~g})+\mathrm{N}_2(\mathrm{~g})$ a first order reaction, the variation in partial pressure...

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The reaction between X and Y is first order with respect to X and zero order with respect to Y....

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The half life for the decomposition of gaseous compound A is 240 s when the gaseous pressure was 500 Torr...

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At $30^{\circ} \mathrm{C}$, the half life for the decomposition of $\mathrm{AB}_2$ is 200 s and is independent of the initial...

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For a reaction $A \rightarrow 2 B+C$ the half lives are 100 s and 50 s when the concentration of...

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For a reaction, given below is the graph of $\ln \mathrm{k}$ vs $\frac{1}{\mathrm{~T}}$. The activation energy for the reaction is...

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The equation $$ k=\left(6.5 \times 10^{12} \mathrm{~s}^{-1}\right) \mathrm{e}^{-28000 \mathrm{kJT}} $$ is followed for the decomposition of compound A . The...

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Q JEE MAIN 2022

Catalyst A reduces the activation energy for a reaction by $10 \mathrm{~kJ} \mathrm{~mol}^{-1}$ at 300 K . The ratio of...

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A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is...

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It has been found that for a chemical reaction with rise in temperature by 9K the rate constant gets doubled....

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At 345 K, the half life for the decomposition of a sample of a gaseous compound initially at 55.5 kPa...

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For a first order reaction, the time required for completion of $90 \%$ reaction is ' $x$ ' times the...

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For a first order reaction $A \rightarrow B$, the rate constant, $\mathrm{k}=5.5 \times 10^{-14} \mathrm{~s}^{-1}$ . The time required for...

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The activation energy of one of the reactions in a biochemical process is 532611 J $\mathrm{mol}^{-1}$. When the temperature falls...

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The rate constants for decomposition of acetaldehyde have been measured over the temperature range 700 1000 K . The data...

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The rate constant for a first order reaction is given by the following equation: $\ln \mathrm{k}=33.24-\frac{2.0 \times 10^4 \mathrm{~K}}{\mathrm{~T}}$ The...

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Q JEE MAIN 2022

A flask is filled with equal moles of A and B. The half lives of A and B are 100...

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For a given chemical reaction $\gamma_1 A+\gamma_2 B \rightarrow \gamma_3 C+\gamma_4 D$ Concentration of C changes from 10 mmol $\mathrm{dm}^{-3}$...

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Q JEE MAIN 2024

The following data were obtained during the first order thermal decomposition of a gas A at constant volume:

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$\mathrm{r}=\mathrm{k}[\mathrm{A}]$ for a reaction, $50 \%$ of A is decomposed in 120 minutes. The time taken for $90 \%$ decomposition...

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$\mathrm{NO}_2$ required for a reaction is produced by decomposition of $\mathrm{N}_2 \mathrm{O}_5$ in $\mathrm{CCl}_4$ as by equation $...

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Q JEE MAIN 2024

The half-life of radioisotopic bromine - 82 is 36 hours. The fraction which remains after one day is $\times 10^{-2}$....

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Time required for completion of $99.9 \%$ of a First order reaction is times of half life $\left(t_{1 / 2}\right)$...

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Half life of zero order reaction $\mathrm{A} \rightarrow$ product is 1 hour, when initial concentration of reactant is $2.0 \mathrm{molL}^{-1}$....

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Consider the following plots of log of rate constant $k(\log k)$ vs $\frac{1}{T}$ for three different reactions. The correct order...

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The rate constant for a first order reaction is $20 \mathrm{~min}^{-1}$. The time required for the initial concentration of the...

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$\mathrm{A}(\mathrm{g}) \rightarrow \mathrm{B}(\mathrm{g})+\mathrm{C}(\mathrm{g})$ is a first order reaction. The reaction was started with reactant A only. Which of the following...

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In a first order decomposition reaction, the time taken for the decomposition of reactant to one fourth and one eighth...

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$\mathrm{A}(\mathrm{g}) \rightarrow 2 \mathrm{~B}(\mathrm{~g})+\mathrm{C}(\mathrm{g})$ is a first order reaction. The initial pressure of the system was found to be 800...

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Q JEE MAIN 2025

Consider the following statements related to temperature dependence of rate constants. Identify the correct statements. A. The Arrhenius equation holds...

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The number of incorrect statement/s from the following is ______. A. The successive half-lives of zero order reactions decreases with...

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For a chemical reaction A + B  Product, the order is 1 with respect to A and B. What...

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The correct reaction profile diagram for a positive catalyst reaction

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The reaction $2 \mathrm{NO}+\mathrm{Br}_2 \rightarrow 2 \mathrm{NOBr}$ takes places through the mechanism given below: $\mathrm{NO}+\mathrm{Br}_2 \Leftrightarrow \mathrm{NOBr}_2$ (fast) $...

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Q JEE MAIN 2023

Consider the following reaction that goes from A to B in three steps as shown below:- Choose the correct

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$A \rightarrow B$ The above reaction is of zero order. Half life of this reaction is 50 min. The time...

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A first order reaction has the rate constant, $\mathrm{k}=4.6 \times 10^{-3} \mathrm{~s}^{-1}$. The number of correct statement/s from the following...

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For conversion of compound $\mathrm{A} \rightarrow \mathrm{B}$, the rate constant of the reaction was found to be $...

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An organic compound undergoes first order decomposition. If the time taken for the 60% decomposition is 540 s, then the...

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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 of the...

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A student has studied the decomposition of a gas AB 3 at $25^{\circ} \mathrm{C}$. He obtained the following data. The...

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$t_{87.5}$ is the time required for the reaction to undergo $87.5 \%$ completion and $t_{50}$ is the time required for...

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$\mathrm{KClO}_3+6 \mathrm{FeSO}_4+3 \mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{KCl}+3 \mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3+3 \mathrm{H}_2 \mathrm{O}$ The above reaction was studied at 300 K by monitoring the...

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Q JEE MAIN 2023

A molecule undergoes two independent first order reactions whose respective half lives are 12 min and 3 min. If both...

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Q JEE MAIN 2023

The number of given statement/s which is/are correct is____.

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For the adsorption of hydrogen on platinum, the activation energy is 30 kJ $\mathrm{mol}^{-1}$ and for the adsorption of hydrogen...

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Q JEE MAIN 2023

The number of correct statement/s from the following is _______.

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If compound A reacts with B following first order kinetics with rate constant 2.011 × $10(–3)s(–1)$. The time taken by...

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$$ A \rightarrow B $$ The rate constants of the above reaction at 200 K and 300 K are $...

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A and B are two substances undergoing radioactive decay in a container. The half life of A is 15 min...

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For certain chemical reaction X Y, the rate of formation of product is plotted against the time as shown in...

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For the first order reaction $\mathrm{A} \rightarrow \mathrm{B} \mathrm{Br}$ the half life is 30 mm . The time taken for...

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The number of correct statement/s from the following is _______. A. Larger the activation energy, smaller is the value of...

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Q JEE MAIN 2024

The ratio of ( ^14 C)/( ^12 C) in a piece of wood is 1/8 part that of atmosphere. If...

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Given below are two statements : Statement I : The rate law for the reaction A+B→C is rate (r)=k[A]^2 ["...

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Q JEE MAINS 2024

Consider the following transformation involving first order elementary reaction in each step at constant temperature as shown below. $...

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Consider the following reaction A+B→C The time taken for A to become $1 / 4^{\text {th }}$ of its initial...

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During Kinetic study of reaction 2 A+B→C+D, the following results were obtained : Based on above data, overall order of...

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Time required for 99.9% completion of a first order reaction is time the time required for completion of 90% reaction.(nearest...

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For a reaction taking place in three steps at same temperature, overall rate constant K=(K_1 〖" " K〗_2)/〖" " K〗_3...

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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...

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Q JEE MAIN 2025

For the reaction $A \rightarrow B$ the following graph was obtained. The time required (in seconds) for the concentration of...

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Reactant A converts to product D through the given mechanism (with the net evolution of heat) : $\mathrm{A} \rightarrow \mathrm{B}$...

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Consider the following data for the given reaction $2 \mathrm{HI}_{(\mathrm{g})} \rightarrow \mathrm{H}_{2(\mathrm{~g})}+\mathrm{I}_{2(\mathrm{~g})}$ The order of the reaction is

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Q JEE MAIN 2025

Drug $X$ becomes ineffective after $50 \%$ decomposition. The original concentration of drug in a bottle was $...

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Q JEE MAIN 2025

Reaction ${\rm{A}}({\rm{g}}) \to 2\;{\rm{B}}(\;{\rm{g}}) + {\rm{C}}({\rm{g}})$ is a first order reaction. It was started with pure A Which of the...

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Q JEE MAIN 2025

A person's wound was exposed to some bacteria and then bacterial growth started to happen at the same place. The...

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For $\mathrm{A}_2+\mathrm{B}_2 \rightleftharpoons 2 \mathrm{AB}$ ${{\rm{E}}_{\rm{a}}}$ for forward and backward reaction are 180 and $200\;{\rm{kJ}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}$ respectively If catalyst...

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Q JEE MAIN 2025

Rate law for a reaction between A and B is given by ${\rm{r}} = {\rm{k}}{[\;{\rm{A}}]^{\rm{n}}}{[\;{\rm{B}}]^{\rm{m}}}$ If concentration of A is...

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Q JEE MAIN 2025

For bacterial growth in a cell culture, growth law is very similar to the law of radioactive decay. Which of...

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Q JEE MAIN 2025

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 is suddenly reduced to $\frac{1}{3}$ of its...

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Q JEE MAIN 2025

In a reaction $A + B \to C$, initial concentrations of A and B are related as ${[A]_0} = 8{[B]_0}$....

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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...

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Given below are two statements : In the light of the above statements, choose the correct answer from the options...

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For the reaction A $\rightarrow$ products The concentration of A at 10 minutes is _____$ \times {10^{-3}}mol{L^{-1}}$ (nearest integer). The...

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Q JEE MAIN 2025

Which of the following graphs most appropriately represents a zero order reaction?

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The reaction ${A_2} + {B_2} \to 2{\rm{AB}}$ follows the mechanism

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For a given reaction $R \to P,{t_{1/2}}$ is related to ${[A]_0}$ as given in table. Given: $\log 2 = 0.30$...

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Q JEE MAIN 2025

For the thermal decomposition of ${{\text{N}}_{2}}{{\text{O}}_{5}}(~\text{g})$ at constant volume, the following table can be formed, for the reaction mentioned below....

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Q JEE MAIN 2025

Consider the given figure and choose the correct option :

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Q JEE MAIN 2025

Which of the following statement is not true for radioactive decay?

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${\rm{A}} \to \;{\rm{B}}$ The molecule A changes into its isomeric form B by following a first order kinetics at a...

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