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Chemical Kinetics

67 questions · Chemistry · NEET
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Chemical Kinetics

67 questions · Chemistry · NEET

  1. If the half-life ( t1/2​ ) for a first order reaction is 1 minute, then the time required for 99.9% completion of the reaction is closest to :2025 · Q118 · MCQ
  2. If the rate constant of a reaction is 0.03 s−1, how much time does it take for 7.2 mol L−1 concentration of the reactant to get reduced to 0.9 mol L−1 ? (Given: $\log…2025 · Q94 · MCQ
  3. Activation energy of any chemical reaction can be calculated if one knows the value of2024 · Q111 · MCQ
  4. Which plot of lnk vs  T1​ is consistent with Arrhenius equation?2024 · Q117 · MCQ
  5. The rate of a reaction quadruples when temperature changes from 27∘C to 57∘C. Calculate the energy of activation. Given R=8.314 J K−1 mol−1,log4=0.6021…2024 · Q141 · MCQ
  6. Following data is for a reaction between reactants A and B :  The order of the reaction with respect to A and B, respectively, are  Includes table2024 · Q102 · MCQ
  7. Which of the following plot represents the variation of lnk versus  T1​ in accordance with Arrhenius equation?2024 · Q131 · MCQ
  8. Rate constants of a reaction at 500 K and 700 K are 0.04 s−1 and 0.14 s−1, respectively; then, activation energy of the reaction is : (Given: log3.5=0.5441,R=8.31 J K−1 mol−1…2024 · Q147 · MCQ
  9. The correct options for the rate law that corresponds to overall first order reaction is2023 · Q109 · MCQ
  10. For a reaction 3 A→2 B The average rate of appearance of B is given by ΔtΔ[B]​. The correct relation between the average rate of appearance of B with the…2023 · Q98 · MCQ
  11. For a certain reaction, the rate =k[A]2[ B], when the initial concentration of A is tripled keeping concentration of B constant, the initial rate would2023 · Q88 · MCQ
  12. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : A reaction can have zero activation energy. Reason R : The minimum extra amount of energy absorbed by reactant molecules so…2023 · Q96 · MCQ
  13. For a chemical reaction 4A + 3B → 6C + 9D Rate of formation of C is 6 × 10−2 mol L−1 s−1 and rate of disappearance of A is 4 × 10−2 mol L−1 s−1. The rate of reaction and amount of B consumed in interval of 10…2022 · Q130 · MCQ
  14. The given graph is a representation of kinetics of a reaction The y and x axes for zero and first order reactions, respectively are Includes diagram2022 · Q101 · MCQ
  15. For a first order reaction A → Products, initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. Rate constant for the reaction in min−1 is2022 · Q118 · MCQ
  16. For a reaction, A → B, enthalpy of reaction is −4.2 kJ mol−1 and enthalpy of activation is 9.6 kJ mol−1. The correct potential energy profile for the reaction is shown in option.2021 · Q114 · MCQ
  17. The slope of Arrhenius plot (lnkv/sT1​) of first order reactino is −5 × 103K. The value of Ea of the reaction is. Choose the correct option for your answer. [Given R = 8.314 JK−1mol−1]2021 · Q120 · MCQ
  18. The rate constant for a first order reaction is 4.606 × 10-3 s-1. The time required to reduce 2.0 g of the reactant to 0.2 g is :2020 · Q104 · MCQ
  19. An increase in the concentration of the reactants of a reaction leads to change in :2020 · Q90 · MCQ
  20. If the rate constant for a first order reaction is k, the time (t) required for the completion of 99 % of the reaction is given by :2019 · Q84 · MCQ
  21. For the chemical reaction N2(g) + 3H2(g) ⇌ 2NH3(g) the correct option is :2019 · Q86 · MCQ
  22. The correct difference between first and second order reactions is that2018 · Q82 · MCQ
  23. When initial concentration of the reactant is doubled, the half-life period of a zero order reaction2018 · Q83 · MCQ
  24. Mechanism of a hypothetical reaction X2 + Y2 → 2XY, is given below : (i) X2 → X + X (fast) (ii) X + Y2 ⇌ XY + Y (slow) (iii) X + Y → XY (fast) The overall order of the reaction will be2017 · Q91 · MCQ
  25. A first order reaction has a specific reaction rate of 10−2 sec−1. How much time will it take for 20 g of the reactant to reduce to 5 g?2017 · Q92 · MCQ
  26. The rate of first-order reaction is 0.04 mol L−1 s−1 at 10 seconds and 0.03 mol L−1 s−1 at 20 seconds after initiation of the reaction. The half-life period of the reaction is2016 · Q90 · MCQ
  27. The addition of a catalyst during a chemical reaction alters which of the following quantities?2016 · Q91 · MCQ
  28. The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the2016 · Q93 · MCQ
  29. The rate constant of the reaction A → B is 0.6 × 10−3 mol L−1 s−1. If the concentration of A is 5 M, then concentration of B after 20 minutes is2015 · Q83 · MCQ
  30. When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is2015 · Q85 · MCQ
  31. The activation energy of a reaction can be determined from the slope of which of the following graphs?2015 · Q86 · MCQ
  32. For a reaction between A and B the order with respect to A is 2 and the other with respect to B is 3. The concentrations of both A and B are doubled, the rate will increase by a factor of2013 · Q90 · MCQ
  33. A reaction is 50% complete in 2 hours and 75% complete in 4 hours. The order of reaction is2013 · Q91 · MCQ
  34. What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20oC to 35oC? (R = 8.314 J mol−1 K−1)2013 · Q90 · MCQ
  35. Activation energy (Ea) and rate constants (k1 and k2) of a chemical reaction at two different temperatures (T1 and T2) are related by2012 · Q65 · Multiple correct
  36. In a reaction, A + B → product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentration of both the reactants (A and B) are doubled, rate law for the reaction can be written…2012 · Q101 · MCQ
  37. In a zero-order reaction, for every 10oC rise of temperature, the rate is doubled. If the temperature is increased from 10oC to 100oC, the rate of the reaction will become2012 · Q102 · MCQ
  38. The unit of rate constant for a zero order reaction is2011 · Q62 · MCQ
  39. The half-life of a substance in a certain enzyme-catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L−1 to 0.04 mg L−1 is2011 · Q63 · MCQ
  40. The rate of the reaction : 2N2O5 → 4NO2 + O2 can be written in three ways. dt−d[N2​O5​]​=k[N2​O5​] dtd[NO2​]​=k′[N2​O5​];…2011 · Q64 · MCQ
  41. Which one of the following statements for the order of a reaction is incorrect?2011 · Q96 · MCQ
  42. The rate of the reaction, 2NO + Cl2 → 2NOCl is given by the rate equation rate = k[NO]2[Cl2]. The value of the rate constant can be increased by2010 · Q54 · MCQ
  43. For the reaction N2O5(g) → 2NO2(g) + 1/2O2(g) the value of rate of disappearance of N2O5 is given as 6.25 × 10−3 mol L−1 s−1. The rate of formation of NO2 and O2 is given respectively as2010 · Q106 · MCQ
  44. During the kinetic study of the reaction, 2A + B → C + D, following results were obtained Based on the above data which one of the following is correct? Includes table2010 · Q107 · MCQ
  45. In the reaction, BrO3(aq)−​ + 5Br(aq)−​ + 6H+ → 3Br2(l) + 3H2O(l). The rate of appearance of bromine (Br2) is related to rate of disappearance of bromide ions as2009 · Q100 · MCQ
  46. For the reaction A + B → products, it is observed that (i) on doubling the initial concentration of A only, the rate of reaction is also doubled and (ii) on doubling the initial concentration of both A and B, there is a change by a…2009 · Q101 · MCQ
  47. Half-life period of a first order reaction is 1386 seconds. The specific rate constant of the reaction is2009 · Q102 · MCQ
  48. For the reaction, N2 + 3H2 → 2NH3, if dtd[NH3​]​ = 2 × 10−4 mol L−1 s−1, the value of dt−d[H2​]​ would be2009 · Q99 · MCQ
  49. The rate constants k1 and k2 for two different reactions are 1016 ⋅ e−2000/T and 1015 ⋅ e−1000/T, respectively. The temperature at which k1 = k2 is2008 · Q100 · MCQ
  50. The bromination of acetone that occurs in acid solution is represented by this equation. CH3COCH3(aq) + Br2(aq) → CH3COCH2Br(aq) + H+(aq) + Br−(aq) These kinetic data were obtained for given reaction concentrations. Based on these… Includes table2008 · Q101 · MCQ
  51. If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately (log 4 = 0.60, log 5 = 0.69)2007 · Q88 · MCQ
  52. In a first-order reaction A → B, if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is2007 · Q89 · MCQ
  53. The reaction of hydrogen and iodine monochloride is given as : H2(g) + 2ICl(g) → 2HCl(g) + I2(g) This reaction is of first order with respect to H2(g) and ICl(g), following mechanisms were proposed. Mechanism A : H2(g) + 2ICl(g) →…2007 · Q90 · MCQ
  54. Consider the reaction : N2(g) + 3H2(g) → 2NH3(g) The equality relationship between dtd[NH3​]​ and −dtd[H2​]​ is2006 · Q100 · MCQ
  55. For the reaction, 2A + B → 3C + D, which of the following does not express the reaction rate?2006 · Q101 · MCQ
  56. For a first order reaction A → B the reaction rate a reactant concentration of 0.01 M is found to be 2.0 × 10−5 mol L−1 s−1. The half-life period of the reaction is2005 · Q85 · MCQ
  57. The rate of reaction between two reactions 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 reactant B is2005 · Q94 · MCQ
  58. 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 is2004 · Q81 · MCQ
  59. The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, k=A⋅e−E∗/RT. Activation energy (E∗) of the reaction can be calculated by plotting2003 · Q102 · MCQ
  60. If the rate of the reaction is equal to the rate constant, the order of the reaction is2003 · Q103 · MCQ
  61. 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?2003 · Q104 · MCQ
  62. The activation energy for a simple chemical reaction A ⇌ B is Ea in forward direction. The activation energy for reverse reaction2003 · Q105 · MCQ
  63. 2A → B + C It would be a zero order reaction when2002 · Q89 · MCQ
  64. When a bio-chemical reaction is carried out in laboratory, outside the human body in absence of enzyme, then rate of reaction obtained is 10−6 times, the activation energy of reaction in the presence of enzyme is2001 · Q98 · MCQ
  65. For the reaction; 2N2O5 → 4NO2 + O2 rate and rate constant are 1.02 × 10−4 and 3.4 × 10−5 sec−1 respectively, then concentration of N2O5 at that time will be2001 · Q99 · MCQ
  66. How enzymes increases the rate of reactions2000 · Q97 · MCQ
  67. For the reaction H+ + BrO3−​ + 3Br− → 5Br2 + H2O which of the following relation correctly represents the consumption and formation of products.2000 · Q98 · MCQ