JEE Main PYQs — Chemical Kinetics

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 homogeneous…

Reactant A converts to product D through the given mechanism (with the net evolution of heat): A -> B slow; H = +ve B -> C fast; H = -ve C -> D fast; H = -ve Which of the following represents the…

The reaction A2 + B2 -> 2AB follows the mechanism: The overall order of the reaction is:

Drug X becomes ineffective after 50% decomposition. The original concentration of drug in a bottle was 16 mg/mL which becomes 4 mg/mL in 12 months. The expiry time of the drug in months is ________.…

| [A]0 / mol L-1 | t1/2 / min | |---|---| | 0.100 | 200 | | 0.025 | 100 | For reaction R P, t1/2 is related to [A]0 as above. Given: 2 = 0.30. Which of the following is true? (A) The order of the…

Reaction A(g) -> 2B(g) + C(g) is a first order reaction. It was started with pure A. | t/min | Pressure of system at time t/mm Hg | |---|---| | 10 | 160 | | | 240 | Which of the following option is…

A person's wound was exposed to some bacteria and then bacteria growth started to happen at the same place. The wound was later treated with some antibacterial medicine and the rate of bacterial…

Consider the elementary reaction {A(g) + B(g)} {C(g) + D(g)} If the volume of reaction mixture is suddenly reduced to 13 of its initial volume, the reaction rate will become 'x' times of the original…

For a reaction, N2O5(g) 2NO2(g) + 12O2(g) in a constant volume container, no products were present initially. The final pressure of the system when 50% of reaction gets completed is: (a) 7/2 times of…

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 t1 and t2 (s), respectively. The ratio t1t2…

For a reaction A K1 B K2 C If the rate of formation of B is set to be zero then the concentration of B is given by:

Integrated rate law equation for a first order gas phase reaction is given by (where Pi is initial pressure and Pt is total pressure at time t):

Consider the following reaction that goes from A to B in three steps as shown below: Choose the correct option: | | Number of Intermediates | Number of Activated Complexes | Rate determining step |…

For a chemical reaction A + B Product, the order is 1 with respect to A and B. | Rate mol\,L-1\,s-1 | [A]\,mol\,L-1 | [B]\,mol\,L-1 | |:---:|:---:|:---:| | 0.10 | 20 | 0.5 | | 0.40 | x | 0.5 | | 0.80…

A student has studied the decomposition of a gas AB3 at 25°C. He obtained the following data: | p\,(mm\,Hg) | Relative t1/2\,(s) | |:---:|:---:| | 50 | 4 | | 100 | 2 | | 200 | 1 | | 400 | 0.5 | The…

The correct reaction profile diagram for a positive catalyst reaction.

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: 10 = 2.303 and 2 = 0.3010)

At 30°C, the half life for the decomposition of AB2 is 200 s and is independent of the initial concentration of AB2. The time required for 80% of the AB2 to decompose is (Given: 2 = 0.30; 3 = 0.48)

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

Consider the given plot of enthalpy of the following reaction between A and B: {A + B C + D} Identify the incorrect statement.

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

Isotope(s) of hydrogen which emits low energy - particles with t1/2 value > 12 years is/are

For the reaction 2A + 3B + 32C 3P, which statement is correct?

For the equilibrium A B, the variation of the rate of the forward (a) and reverse (b) reaction with time is given by:

The graph which represents the following reaction is: {(C_6H_5)_3C{-}Cl} {{OH^-/Pyridine}} {(C_6H_5)_3C{-}OH}

The results given in the below table were obtained during kinetic studies of the following reaction: {2A + B C + D} | Experiment | [A]\,/\,mol\,L-1 | [B]\,/\,mol\,L-1 | Initial rate mol\,L-1\,min-1 |…

For the reaction 2H2(g) + 2NO(g) N2(g) + 2H2O(g), the observed rate expression is: rate = kf[NO]2[H2]. The rate expression for the reverse reaction is:

For the following reactions: {A} {700\,{K}} {Product} {A} [{catalyst}]{500\,{K}} {Product} It was found that the Ea is decreased by 30\,kJ/mol in the presence of catalyst. If the rate remains…

Consider the following reactions: {A P_1; B P_2; C P_3; D P_4} The order of the above reactions are a, b, c and d, respectively. The following graph is obtained when [rate] vs [conc.] are plotted:…

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 enzyme is:

The rate constant (k) of a reaction is measured at different temperature (T), and the data are plotted in the given figure. The activation energy of the reaction in kJ\,mol-1 is \\\\: (R is gas…

Consider the following plots of rate constant versus 1T for four different reactions. Which of the following orders is correct for the activation energies of these reactions?

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 concentrations of A and B are…

It is true that:

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

If a reaction follows the Arrhenius equation, the plot k vs 1RT gives straight line with a gradient (-y) unit. The energy required to activate the reactant is:

NO2 required for a reaction is produced by the decomposition of N2O5 in CCl4 as per the equation: {2N_2O_5(g) 4NO_2(g) + O_2(g)} The initial concentration of N2O5 is 3.00\,mol\,L-1 and it is…

Consider the given plots for a reaction obeying Arrhenius equation (0°C < T < 300°C): (K and Ea are rate constant and activation energy, respectively)

For the reaction 2A + B C, the values of initial rate at different reactant concentrations are given in the table below. The rate law for the reaction is: | [A]\,(mol\,L-1) | [B]\,(mol\,L-1) |…

Decomposition of X exhibits a rate constant of 0.05\,g/year. How many years are required for the decomposition of 5\,g of X into 2.5\,g?

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 of the reaction are

For the reaction, 2A + B products, when the concentration of A and B both were doubled, the rate of the reaction increased from 0.3\,mol\,L-1\,s-1 to 2.4\,mol\,L-1\,s-1. When the concentration of A…

The reaction 2X 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 concentration of X is 0.5 M, the time required to reach its final…

For a reaction scheme A k1 B k2 C, if the net rate of formation of B is set to be zero then the concentration of B is given by:

For an elementary chemical reaction, A2 k-1k1 2A, the expression for d[A]dt is:

Consider the following reversible chemical reactions: {A_2(g) + B_2(g)} {}{{k_1}{}} {2AB(g)} (1) {6AB(g)} {}{{k_2}{}} {3A_2(g) + 3B_2(g)} (2) The relation between K1 and K2 is:

A bacterial infection in an internal wound grows as N'(t) = N0(t), where the time t is in hours. A dose of antibiotic, taken orally, needs 1 hour to reach the wound. Once it reaches there, the…

For the reaction of H2 and I2, the rate constant is 2.5 10-4\,dm3\,mol-1\,s-1 at 327°C and 1.0\,dm3\,mol-1\,s-1 at 527°C. The activation energy for the reaction, in kJ\,mol-1 is: (R =…

For a reaction, consider the plot of 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 rate constant at 500 K is:

The following results were obtained during kinetic studies of the reaction: {2A + B product} | Experiment | [A]\,(mol\,L-1) | [B]\,(mol\,L-1) | Initial rate of reaction \,(mol\,L-1\,min-1) |…

In the following reaction: xA yB _{10}[-{d[{A}]}{dt}] = _{10}[-{d[{B}]}{dt}] + 0.3010 'A' and 'B' respectively can be: