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Class 12 Chemistry: Chemical Kinetics
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MCQs on chemical reaction rate and factors, integrated rate equations, pseudo first order reaction, chemical reactions temperature dependence and collision theory.
 

Class 12 Chemistry: Chemical Kinetics
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25 Questions

1. The reaction NO2 + CO → NO + CO2 takes place in two steps. Find the rate law.
2NO2 → NO + NO3 (k1) – slow
NO3 + CO → CO2 + NO2 (k2) – fast
2. Which of the following is the correct Arrhenius equation?
3. Which of the following is a factor that automobile engines use to increase the rate of its internal reactions?
4. What is the time required for 75 percent completion of a first-order reaction?
5. The rate constant of a reaction is k=3.28 × 10-4 s-1. Find the order of the reaction.
6. Which of the following is not an example of a pseudo first-order reaction?
7. Which of the following laws state that the rate of a chemical reaction is directly proportional to the concentration of reactants?
8. What is the rate of reaction for a bimolecular elementary reaction?
9. Which of the following represents the Boltzmann factor?
10. For the reaction C2H5COOC2H5 + H2O → C2H5COOH + C2H5OH, find the concentration of [C2H5COOC2H5] if the rate constant k=0.2 and the rate of the reaction is 0.39 s-1.
11. The decomposition of N2O5 in CCl4 solution was studied. N2O5 → 2NO2 + 1/2O2. The rate constant of the reaction is 6.2 x 10-4 sec-1. Calculate the rate when the concentration of N2O5 is 1.25 molar.
12. What happens to the value of ΔG of a reaction when a catalyst is added to it?
13. Which of the following explains the increase in the reaction rate by a catalyst?
14. Which of the following is a drawback of collision theory?
15. The activation energy of a reaction is 50 kJ mol-1 and the value of rate constant at 300 K is 2.5×10-5 sec-1. What is the value of the frequency factor, A?
16. For a certain reaction the values of Arrhenius factor and Activation energy are 4 x 1013 collision/sec and 98.6KJ/mol at 303K. Calculate the rate constant if reaction is 1st order?( R=8.341mol-1K-1)
17. What are the factors that determine an effective collision?
18. Who put forward the collision theory of chemical reactions?
19. What is the rate law for acid hydrolysis of an ester such as CH3COOC2H5 in aqueous solution?
20. What happens to the rate of the reaction on increasing its temperature?
21. What is the rate law of hydrolysis of CH3COOC2H5 in aqueous solution?
22. What is the concentration of the reactant in a first order reaction when the rate of the reaction is 0.6 s-1 and the rate constant is 0.035?
23. The rate law for inversion of cane sugar is R=k [C12H22O11][H2O]. Find the concentration of sucrose if the rate of the reaction is 0.032 s-1 and rate constant k=0.005.
24. A zero-order reaction is 25% complete in 30seconds. What time does it take for 50% completion?
25. Which of the following reactions is an example of a pseudo first-order reaction?

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