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MCQs

Total Questions : 2307 | Page 5 of 231 pages
Question 41. A catalyst in a chemical reaction __________ free energy change in the reaction.
  1.    Increases
  2.    Decreases
  3.    Either A or B; depends on the type of catalyst
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Either A or B; depends on the type of catalyst
Question 42. The rate of a homogeneous reaction is a function of
  1.    Temperature and pressure only
  2.    Temperature and composition only
  3.    Pressure and composition only
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 43. Space time equals the mean residence time
  1.    When the density of the reaction mixture is constant
  2.    For large diameter tubular reactor
  3.    For narrow diameter tubular reactor
  4.    For CSTR
 Discuss Question
Answer: Option A. -> When the density of the reaction mixture is constant
Question 44. An imbalanced chemical reaction equation is against the law of
  1.    Multiple proportion
  2.    Conservation of mass
  3.    Constant proportion
  4.    None of these
 Discuss Question
Answer: Option B. -> Conservation of mass
Question 45. Reverse reaction in a chemical equilibrium is favoured by the
  1.    Removal of one of the products regularly
  2.    Increase in the concentration of oneof the products
  3.    Increase in the concentration of one of the reactants
  4.    None of these
 Discuss Question
Answer: Option B. -> Increase in the concentration of oneof the products
Question 46. For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is
  1.    2
  2.    4
  3.    11
  4.    22
 Discuss Question
Answer: Option C. -> 11
Question 47. A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is - 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be
  1.    5°C
  2.    10°C
  3.    20°C
  4.    100°C
 Discuss Question
Answer: Option B. -> 10°C
Question 48. The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is
  1.    0
  2.    1
  3.    2
  4.    3
 Discuss Question
Answer: Option C. -> 2
Question 49. Carrier in a catalyst increases its
  1.    Surface area
  2.    Activity
  3.    Performance
  4.    None of these
 Discuss Question
Answer: Option A. -> Surface area
Question 50. Rate determining step in a reaction consisting of a number of steps in series is the __________ step.
  1.    Fastest
  2.    Slowest
  3.    Intermediate
  4.    Data insufficient; can't be predicted
 Discuss Question
Answer: Option B. -> Slowest

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