Q1. For a first order reaction A → B, the half life is 30 min. The time taken for 75% completion of the reaction is ______ min. (Nearest integer) (Given: log 2 = 0.3010)

Q2. A molecule undergoes two independent first order reactions whose respective half lives are 12 min and 3 min. If both reactions are occurring simultaneously, the time taken for 50% consumption of the reactant is ______ min. (Nearest integer)

Q3. In a first order decomposition reaction, the time taken for decomposition of reactant to one fourth and one eighth of its initial concentration are t₁ and t₂ respectively. The ratio t₁ / t₂ will be:

Q4. For the given first order reaction A → B, the half life is 0.3010 min. The ratio of the initial concentration of reactant to the concentration at time 2.0 min will be equal to ______ (Nearest integer).

Q5. A and B are two substances undergoing radioactive decay. The half life of A is 15 min and that of B is 5 min. If the initial concentration of B is four times that of A and both start decaying at the same time, how much time will it take for the concentration of both to become equal? ______ min.

Q6. Consider an elementary reaction: A(g) + B(g) → C(g) + D(g) If the volume of reaction mixture is suddenly reduced to 1/3 of its initial volume, the reaction rate will become x times of the original rate. The value of x is:

Q7. Time required for 99.9% completion of a first order reaction is ______ times the time required for completion of 90% reaction. (Nearest integer)

Q8. Consider the reaction A + B → C rate = k[A]¹ᐟ²[B]¹ᐟ² Initially, concentration of A and B are 1 M each. If rate constant k = 4.6 × 10⁻² s⁻¹, the time taken for A to become 0.1 M is ______ sec. (Nearest integer)

Q9. For a reaction taking place in three steps at same temperature, overall rate constant K = (K₁K₂)/K₃. If Eₐ₁, Eₐ₂ and Eₐ₃ are 40, 50 and 60 kJ mol⁻¹ respectively, the overall activation energy is ______ kJ mol⁻¹.

Q10. Which of the following plots is a straight line for a first order reaction?