Chemical Kinetics MCQs Mock Test of Class 12th Chemistry

Welcome to your Chemical Kinetics MCQs Mock Test of Class 12th Chemistry

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Question 1. The rate constant for the reaction 2N2O5 → 4NO2 + O2 is 3.0 × 10-5 sec-1. If the rate is 2.40 × 10-5 mol litre-1 sec-1, then the concentration of N2O5 (in mol litre-1) is:
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Question 2. When a biochemical reaction is carried out in laboratory from outside of human body in absence of enzyme, then the rate of reaction obtained is 10-6 times, then activation energy of reaction in presence of enzyme is:
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Question 3. If ‘I’ is the intensity of absorbed light and ‘C’ is the concentration of AB for the photochemical process AB + hv → AB+, the rate of formation of AB* is directly proportional to:
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Question 4. In the following reaction, how is the rate of appearance of the underlined product related to the rate of disappearance of the underlined reactant? BrO−3 (aq) + 5 Br– +6H+ → 3 Br2 (1) + 3H2O (l)
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Question 5. For a chemical reaction, X + 2Y → Z, if the rate of appearance of Z is 0.50 moles per litre per hour, then the rate of disappearance of Y is
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Question 6. For the reaction, NO2 (g) + CO (g) → NO (g), the correct expression for the rate of the reaction is
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Question 7. The rate of a reaction is primarily determined by the slowest step. This step is called
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Question 8. The reaction of high molecularity are rare because
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Question 9. For a chemical reaction A → B, it is found that the rate of the reaction quardruples when the concentration of A is doubled. The rate expression for the reaction is, rate = k [A]n where the value of n is
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Question 10. On increasing the temperature of the reacting system by 10° the rate of reaction almost becomes double. The most appropriate reason for this is that
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Question 11. The half-life period of any first order reaction
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Question 12. The dimensions of rate constant of 2nd order reaction involves
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Question 13. A zero order reaction A → Products, has rate constant 10-2 mole L-1 s-1. If a process is started with 10 moles of A in a one litre vessel, the number of moles of reactant after 10 minutes will be
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Question 14. For which of the following reactions, the temperature coefficient is maximum?
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Question 15. A hypothetical reaction 2p + q → s + r has rate constant as 2.0 × 10-3 mol L-1 s-1. The order of the reaction is
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Question 16. The ratio t7/8 : t1/2 for the first order is
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Question 17. The molecularity of the reaction cannot be
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Question 18. For the first order reaction, the half-life is independent of
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Question 19. For a certain reaction aA → bB, the rate of reaction is doubled when the concentration of A is increased by four times. The rate ot reaction is equal to
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Question 20. The half life period of first order reaction is 1386 seconds. The specific rate constant of the reaction is
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Question 21. The rate constant of a reaction A → B is 0.6 × 103 mole per second. If the concentration of [A] is 5 M, then what will be concentration of [B] after 20 months?
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Question 22. Which of the following is affected by catalyst?
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Question 23. A first order reaction has specific reaction rate 10-2s-1. How much time it will take for 20g of reactant to reduce to 5g?
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Question 24. The rate law for the chemical reaction, 2NO2Cl → 2NO2 + Cl2 is r = k[NO2Cl]. Which of the following is rate controlling step?
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Question 25. Rate constant of a reaction depends upon
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Question 26. DDT on exposure to water decomposes. Half-life = 10 years. How much time will it take for its 90% decomposition?
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Question 27. The rate of a first order reaction is 1.5 × 10-2 mol L-1 min-1 at 0.5 M concentration of the reactant. The half-life of the reaction is
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Question 28. The rate equation for the reaction 2A + B → C is found to be: rate = k [A] [B]. The correct statement inxelation to this reaction is that the
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Question 29. The reaction 2 SO2 (g) + O2 (g) ⇌ SO3 (g) is carried out in 1 dm³ vessel and 2 dm³ vessel separately. The ratio of the reaction velocities will be
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Question 30. A + 2B → C + D. If- d [A]/dt = 5 × 10-4 mol L-1 s-1, Then – d[B]dtis
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Question 31. Which of the following statements is not correct for order of a reaction?
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Question 32. t1/4 can be taken as the time taken for the concentration of a reactant to drop to 3/4 of its initial value. If the rate constant for a first order reaction is K, then t1/4 can be written as
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Question 32. t1/4 can be taken as the time taken for the concentration of a reactant to drop to 3/4 of its initial value. If the rate constant for a first order reaction is K, then t1/4 can be written as
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Question 34. The reaction A → B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?
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Question 35. The potential energy diagram in the reaction R → P is given. ∆H° of the reaction corresponds to the energy.
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Question 36. The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to the reactant B is
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Question 37. For reaction aA → xP, when [A] = 2.2 mM the rate was found to be 2.4 mMs-1. On reducing the concentration of A to half, the rate changes to 0.6 mMs-1. The order of reaction with respect to A is
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Question 38. The half-lives of two samples are 0.1 and 0.4 second. Their respective concentrations are 200 and 50 respectively. What is the order of the reaction?
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Question 39. In a first order reaction, the concentration of the reactant decreases from 800 mol/dm³ to 50 mol/dm³ in 2 × 104 sec. The rate constant for the reaction in sec-1
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Question 40. For the reaction A + B → C + D, doubling the concentration ofboth the reactants increases the reaction rate by 8 times and doubling the concentration of only B simply doubles the reaction rate. The rate law is given as
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Question 41. In Arrhenius plpt, intercept is equal to
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Question 42. What will be the fraction of molecules having energy equal to or greater than activation energy, Ea?
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Question 43. Chemistry MCQs for Class 12 with Answers Chapter 4 Chemical Kinetics 1 What type of reaction is this?
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Question 44. Which among the following is a false statement?
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Question 45. Which of the following statements about the catalyst is true?
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Question 46. Mechanism of a hypothetical reaction X2 + Y2 → 2 × Y is given below: Chemistry MCQs for Class 12 with Answers Chapter 4 Chemical Kinetics 2 (b) X + Y2 → XY + Y (slow) (c) X + Y → XY (fast) The overall order of reaction is
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Question 47. For the reaction N2 + 3H2 → 2NH3 if Δ[NH3]Δt = 2 × 10-4 mol L-1s-1, the value of −Δ[H2]Δt would be
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Question 48. The rate of a certain hypothetical reaction A + B + C → products is given by r = −d[A]dtK[A]1/2[B]1/3[C]1/4. The order of the reaction is
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Question 49. In the formation of S02 by contact process; 2SO2 + O2 → 2SO3, the rate of reaction was measured as −d[O2]dt = 2.5 × 10-4 mol L-1s-1. at The rate of formation of of S03 will be
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Question 50. For a chemical reaction A→B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is

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