Chemical Kinetics
107 questions in this chapter, page 1 of 3.
Study loop for Chemical Kinetics
1. Practise the PYQsPrevious-year questions, with answers
Arrhenius Activation
ABC26PH0017 · For a reaction, the rate constant k at 27°C was found to be k = 5.4 × 1011 e-50. The activation energy of the reaction is: · DEC 2011 self-practice
ABC26PH0667 · For a reaction, the rate constant at 25°C is doubled when the temperature is raised to 45°C. The activation energy (in kJ mol-1) of the… · 2001-2022 self-practice
ABC26PH0677 · For the formation of B from A, heat liberated is 20 kJ mol-1. If the activation energy for the reaction B → A is 100 kJ mol-1, then the… · 2001-2022
ABC26PH0906 · A first order gaseous reaction is 25% complete in 30 minutes at 227°C and in 10 minutes at 237°C. The activation energy of the reaction is… · DEC 2013 self-practice
ABC26PH0682 · The rate of a chemical reaction doubles when the temperature is changed from 300 K to 310 K. Calculate activation energy in kJ mol-1 · 2001-2022 self-practice
ABC26PH0031 · For a gaseous reaction, 2NO(g) + Cl2(g) → Non-linear T.S. → 2NOCl, the pre-exponential factor in the rate constant is proportional to · DEC 2014 self-practice
ABC26PH0913 · For a gaseous reaction, 2NO(g) + Cl2(g) → Non-linear T.S. → 2NOCl the pre-exponential factor in the rate constant is proportional to · DEC 2014 self-practice
ABC26PH0915 · A reaction A + B + C D follows the mechanism A + B ⇌ AB; AB + C → D in which first step remains essentially in equilibrium. If Delta H is… · DEC 2014 self-practice
ABC26PH0033 · The temperature-dependence of a reaction is given by k = AT2 exp (-E0/RT). The activation energy Ea of the reaction is given by: · JUNE 2015 self-practice
ABC26PH0917 · The temperature-dependence of a reaction is given by k = AT2exp (-E0/RT). The activation energy Ea of the reaction is given by: · JUNE 2015 self-practice
ABC26PH0922 · According to transition state theory, the temperature-dependence of pre-exponential factor (A) for a reaction between a linear and a… · JUNE 2015 self-practice
ABC26PH0934 · For a reaction with an activation energy of 49.8 kJ mol-1, the ratio of the rate constants at 600 K and 300 K, (k600/k300), is… · DEC 2016 self-practice
ABC26PH0939 · If the pre-exponential factor in Arrhenius equation is 1.6 × 1012 s-1, the value of the rate constant at extremely high temperature will be… · JUNE 2017 self-practice
ABC26PH0943 · Arrhenius equations for two chemical reactions are: k1 = A1e-E1/RT, k2 = A2e-E2/RT. If E1 > E2 then at a given temperature T · JUNE 2017 self-practice
Chemical Kinetics – General
ABC26PH0471 · A reaction follows second order rate law, -d[A]/dt = k[A]2, if · 2005-2021
ABC26PH0013 · The concentration of a reactant undergoing decomposition was 0.1, 0.08 and 0.067 mol L-1 after 1.0, 2.0 and 3.0 hr respectively. The order… · JUNE 2015
ABC26PH0653 · For the reaction, Q + R k-1k1⇌ X k2 P k1 = 2.5 × 105 L mol-1 s-1, k-1 = 1.0 × 104 s-1 and k2 = 10 s-1. Under steady state approximation… · 2001-2022 self-practice
ABC26PH0878 · The concentration of a reactant undergoing decomposition was 0.1, 0.08 and 0.067 mol L-1 after 1.0, 2.0 and 3.0 hr respectively. The order… · DEC 2011 self-practice
ABC26PH0014 · At any temperature for the following reaction (D and T are deuterium and tritium respectively) correct statement is: (A) HCl + F → HF + Cl… · DEC 2011
ABC26PH0654 · The intensity of a monochromatic visible light is reduced by 90% due to absorption on passing through a 5.0 mM solution of a compound. If… · 2001-2022 self-practice
ABC26PH0015 · An example of a relaxation method of measuring rates is: · DEC 2011
ABC26PH0655 · Elemental analysis of an organic compound contaming C, H and O gives percentage composition: C : 39.9% and H : 6.7%. If the molecular… · 2001-2022 self-practice
ABC26PH0338 · Which of the following statements is NOT correct for a catalyst? · 2005-2021
ABC26PH0339 · The value of the rate constant for the gas phase reaction 2NO2 + F2 → 2NO2F is 38 dm3 mol-1 s-1 at 300 K. The order of the reaction is · 2005-2021
ABC26PH0342 · The reaction, 2NO(g) + O2(g) → 2NO2(g) proceeds via the following steps NO + NO ka N2O2; N2O2 ka^′ NO + NO; N2O2 + O2 kb NO2 + NO2 The rate… · 2005-2021
ABC26PH0343 · The rate constant of two reactions as temperature T are k1(T) and k2(T) and the corresponding activation energies are E1 and E2 with E2>E1… · 2005-2021
ABC26PH0344 · For the reaction 2X3 = 3X2, the rate of formation of X2 is: · 2005-2021
ABC26PH0888 · One of the assumptions made in the conventional activated complex theory is: · JUNE 2012
ABC26PH0345 · In a homogeneous catalytic reaction, 1.0 M of a substrate and 1.0 of a catalyst yields 1.0 mM of a product in 10 seconds. The turnover… · 2005-2021
ABC26PH0018 · The carbon-14 activity of an old wood sample is found to be 14.2 disintegrations min-1 g-1. Calculate age of old wood sample, if for a… · DEC 2011
ABC26PH0346 · For the reaction given below, the relaxation time is 10-6 s. Given that 10% of A remains at equilibrium, the value of k1 (s-1) is A k-1k1⇌ B · 2005-2021
ABC26PH0019 · "Phosphorescence" is represented as · DEC 2011
ABC26PH0666 · A 2.5 × 10-4 M solution of a complex exhibits an absorption maximum at 625 nm with an absorbance of 0.90 when measured in a cuvette with a… · 2001-2022 self-practice
ABC26PH0020 · Using cuvettes of 0.5 cm path length, a 10-4 M solution of a chromophore shows 50% transmittance at certain wave length. The molar… · DEC 2011
ABC26PH0348 · For the parallel first order reaction shown below the value of k1 is 1 × 10-4 s-1. If the reaction starts from X, the ratio of the… · 2005-2021
ABC26PH0892 · Using cuvettes of 0.5 cm path length, a 10-4 M solution of a chromophore shows 50% transmittance at certain wave length. The molar… · JUNE 2012 self-practice
ABC26PH0670 · For a particular reaction at constant temperature, a plot of inverse of reactant concentration (1/([A])) versus time is a straight line… · 2001-2022 self-practice
ABC26PH0353 · The specific rate constant of decomposition of compound is represented by ln k = 5.0 - 12000/T The activation energy of decomposition for… · 2005-2021
ABC26PH0897 · A radioisotope 41Ar initially decays at the rate of 34,500 disintegrations/minute, but decay rate falls to 21,500 disintegrations/minute… · JUNE 2013 self-practice
ABC26PH0673 · The percent transmittance of a solution having absorbance (optical density) 1.0 is · 2001-2022
ABC26PH0023 · In the Lindemann mechanism of unimolecular reactions, the observed order at low concentration is: · DEC 2012 self-practice
ABC26PH0356 · For a given first order reaction, the reactant reduces to 1/4th its initial value in 10 minutes. The rate constant of the reaction is: · 2005-2021
ABC26PH0900 · In the Lindemann mechanism of unimolecular reactions, the observed order at low concentration is: · JUNE 2013 self-practice
ABC26PH0360 · For a reaction involving two steps given below First step: G ⇌ 2H Second step: G + H → P assume that the first step attains equilibrium… · 2005-2021
ABC26PH0904 · A chemical reaction involving nonlinear molecule + nonlinear molecule ⇌ nonlinear activated complex. The number of vibrational degrees of… · JUNE 2013 self-practice
ABC26PH0028 · In the reaction between NO and H2 the following data are obtained Experiment I: PH2 constant Experiment II : PNO = constant The orders with… · DEC 2013 self-practice
ABC26PH0683 · For a reaction with rate equation -dC/dt = kC2, C0 and C are the concentrations of the reactant at time 0 and t respectively. If 10 minutes… · 2001-2022 self-practice