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The quiz is designed for Chemical Kinetics for JEE Main level.
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Question 1 of 15
1. Question
4 pointsThe instantaneous rate of disappearance of the MnO4– ion in the following reaction is 4.56 x 10-3 M s-1.
2MnO4– + 10I– + 16H+ → 2Mn2+ + 5I2 + 8H2O
The rate of appearance of I2 is
(a) 1.14 x 10-3 M s-1 (b) 5.7 x 10-3 M s-1
(c) 4.56 x 10-4 M s-1 (d) 1.14 x 10-2 M s-1
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Question 2 of 15
2. Question
4 pointsThe rate constant for a zero-order reaction is
(a) (b)
(c) (d) \[k=\frac{{{C}_{0}}}{{{C}_{t}}}[/latex]
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Question 3 of 15
3. Question
4 pointsThe half-life periods of decomposition of PH3 for different initial pressures are given below:
p(torr) 707 79 37.5
t1/2(min) 84 84 84
The order of the reaction is
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Question 4 of 15
4. Question
4 pointsThe rate expression for the reaction A(g) + B(g) → C(g) is rate = k CA2 CB1/2.What changes in the initial concentrations of A and B will cause the rate of reaction to increase by a factor of eight?
(a) CA x 2; CB x 2 (b) CA x 2; CB x 4
(c) CA x 1; CB x 4 (d) CA x 4; CB x 1
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Question 5 of 15
5. Question
4 pointsIn a particular reaction the time required to complete half of the reaction was found to increase 16 times when the initial concentration of the reactant was reduced to one fourth. What is the order of the reaction?
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Question 6 of 15
6. Question
4 pointsFor a reaction following first-order kinetics, which of the following statements are correct?
(a) The time taken for the completion of 50% of the reaction is twice t1/2.
(b) The plot of the reciprocal of the concentration of the reactants against time gives a straight line.
(c) The degree of dissociation is equal to 1 – ekt.
(d) A plot of [A]0 / [A] versus time gives a straight line.
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Question 7 of 15
7. Question
4 pointsThe reaction of NO with Cl2 follows the equation; 2NO(g) + Cl2(g) → 2NOCl
The following data were collected:
Initial concentration of NO (mol L-1) Initial concentration of Cl2 (mol L-1) Initial rate of formation of NOCl (mol L-1s-1) 0.10 0.10 2.53 x 10-6 0.10 0.20 5.06 x 10-6 0.20 0.10 10.10 x 10-6 0.30 0.10 22.80 x 10-6
The value of the rate constant is(a) 2.53 x 10-6 (b) 5.06 x 10-6
(c) 10.10 x 10-6 (d) 22.80 x 10-6
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Question 8 of 15
8. Question
4 pointsIn an exothermic reaction X → Y, the activation energy is 100 kJ mol-1 of X. The enthalpy of the reaction is -140 kJ mol-1. The activation energy of the reverse reaction Y → X is
(a) 40 kJ mol-1 (b) 340 kJ mol-1
(c) 240 kJ mol-1 (d) 100 kJ mol-1
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Question 9 of 15
9. Question
4 pointsThe rate constant, the activation energy and the pre-exponential factor of a chemical reaction at 25oC are 8.0 × 10-4 s-1, 112 kJ mol-1 and 4 × 1015 s-1 The value of the rate constant as T → ∞ is
(a) 8 x 1016 s-1 (b) 4 x 104 s-1
(c) 4 x 1015 s-1 (d) 112 x 1012 s-1
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Question 10 of 15
10. Question
4 pointsWhich of the following statements is correct for the activation energy of a reaction?
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Question 11 of 15
11. Question
4 pointsA drop of a solution (volume = 0.05 mL) contains 6 x 10-7 mol of H+. If the rate constant of disappearance of H+ is 6.0 x 105 mol L-1 s-1, how long will it take for the H+ in the drop to disappear?
(a) 8.0 x 10-8 s (b) 2.0 x 10-8 s
(c) 6.0 x 10-6 s (d) 2.0 x 10-2 s
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Question 12 of 15
12. Question
4 pointsThe rate constant for two parallel reactions were found to be 1.0 x 10-2 dm3mol-1s-1 and 3.0 x 10-2 dm3mol-1s-1. If the corresponding energies of activation of the parallel reactions are 60.0 kJ mol-1 and 70.0 kJ mol-1 respectively, what is the apparent overall energy of activation?
(a) 130.0 kJ mol-1 (b) 67.5 kJ mol-1
(c) 100.0 kJ mol-1 (d) 65.0 kJ mol-1
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Question 13 of 15
13. Question
4 pointsAqueous NH4NO2 decomposes according to the first order reaction
NH4NO2 (aq) → N2 (g) + 2H2O (l)
After 20 minutes the volume of N2 collected during such a reaction is 20 mL, and that collected after a very long time is 40 mL. The rate constant for the reaction is
(a) 1.435 x 10-2 min-1 (b) 3.466 x 10-2 min-1
(c) 3.465 x 10-2 min-1 (d) 6.93 min-1
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Question 14 of 15
14. Question
4 pointsThe reaction A(g) + 2B(g) → C(g) + D(g) is an elementary process. In an experiment involving this reaction, the initial partial pressures of A and B are pA = 0.60 atm and pB = 0.80 atm respectively, where pC = 0.20 atm. The rate of reaction relative to the initial rate is
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Question 15 of 15
15. Question
4 pointsWhich of the following statements is correct ?
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