Q.1. Define the rate constant.
Q.2. Define the specific rate of reaction.
Q.3. For a reaction A + B → P, the rate law is given by,
r = k[A]1/2[B]2
What is the order of this reaction?
Q.4. If the rate constant of reaction is k = 3 × 10−4 s−1, then identify the order of the reaction.
Q.5. Define 'order of a reaction'.
Q.6. Identify the reaction order from the following rate constant:
k = 2.3 × 10−5 L mol−1 s −1.
Q.7. Distinguish between molecularity and order of a reaction.
Q.8. For a reaction:
2NH3(g) → N2(g) + 3H2(g)
Rate = k
(i) Write the order and molecularity of this reaction.
(ii) Write the unit of k.
Q.9. Express the rate of the following reaction in terms of the formation of ammonia.
N2(g) + 3H2(g) → 2NH3(g)
Q.10. Define elementary step in a reaction.
Q.11. Why does the rate of a reaction not remain constant throughout the reaction process?
Q.12. For the reaction, 2N2O5(g) → 4NO2(g) + O2(g)
the rate of formation of NO2(g) is 2.8 × 10−3 M s−1. Calculate the rate of disappearance of N2O5(g).
Q.13. What is meant by rate of reaction? Differentiate between average rate and instantaneous rate of reaction.
Q.14. For a reaction R → P, half−life (t1/2) is observed to be independent of the initial concentration of reactants. What is the order of reaction?
Q.15. For a reaction:
H2 + Cl2 → 2HCl ; Rate = k
(i) Write the order and molecularity of this reaction
(ii) Write the unit of k.
Q.16. For a reaction A + B → P, the rate is given by
Rate= k[A] [B]2
(i) How is the rate of reaction affected if the concentration of B is doubled?
(ii) What is the overall order of reaction if A is present in large excess?
Q.17. Define rate of reaction. Write two factors that affect the rate of reaction.
Q.18. Write units of rate constants for zero order and for the second order reactions if the concentration is expressed in mol L−1 and time in second.
Q.19. Write two differences between 'order of reaction' and 'molecularity of reaction:
Q.20. (i) For a reaction, A + B → Product, the rate law is given by,
Rate = k[A]1[B]2
What is the order of the reaction?
(ii) Write the unit of rate constant 'k' for the first order reaction.
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