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Total Questions : 2307 | Page 7 of 231 pages
Question 61. For the liquid phase parallel reactions:R, rR = K?.CA2; E? = 80 KJ/moleS, rS = K?.CA ; E? = 120 KJ/mole The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted at
  1.    Low temperature in a CSTR
  2.    High temperature in a CSTR
  3.    Low temperature in a PFR
  4.    High temperature in a PFR
 Discuss Question
Answer: Option D. -> High temperature in a PFR
Question 62. Which of the following is a controlling factor in very fast heterogeneous reaction?
  1.    Heat and mass transfer effects
  2.    Pressure
  3.    Temperature
  4.    Composition of reactant
 Discuss Question
Answer: Option A. -> Heat and mass transfer effects
Question 63. The catalytic converter for conversion of SO₂ to SO₃ by contact process should have a feed with SO₂ content between
  1.    2-5%
  2.    7-10%
  3.    12-15%
  4.    20-25%
 Discuss Question
Answer: Option B. -> 7-10%
Question 64. In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffacted by pressure changes ?
  1.    2O? ? 3O?
  2.    N? + O? ? 2NO
  3.    2NO? ? N?O?
  4.    2SO? + O? ? 2SO?
 Discuss Question
Answer: Option B. -> N? + O? ? 2NO
Question 65. A multiple reaction may be classified as a __________ reaction.
  1.    Consecutive or side
  2.    Parallel or side
  3.    Mixed
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 66. The single parameter model proposed for describing non-ideal flow is the __________ model.
  1.    Tank in series
  2.    Dispersion
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 67. The exit age distribution of fluid leaving a vessel is used to know the
  1.    Activation energies of a reaction
  2.    Reaction mechanism
  3.    Extent of non-ideal flow in the vessel
  4.    None of these
 Discuss Question
Answer: Option C. -> Extent of non-ideal flow in the vessel
Question 68. Pick out the wrong statement.
  1.    'Hold back' is defined as the fraction of material that stays longer than the mean residence time
  2.    Study of non-ideal flow reactor is done experimentally by stimulus-response technique
  3.    For studying a chemical reaction, it is desirable to monitor the reactants during initial stages and the products during the final stages of reaction
  4.    batch reactor can not be used to study the kinetics of catalytic reaction
 Discuss Question
Answer: Option D. -> batch reactor can not be used to study the kinetics of catalytic reaction
Question 69. In case of staged packed bed reactors carrying out exothermic reaction, use
  1.    High recycle for pure gas
  2.    Plug flow for dilute liquid requiring no large preheating of feed
  3.    Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 70. The rate expression for a heterogenous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + Kr.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A)
  1.    E
  2.    E + ΔHA
  3.    E + ΔHA - ΔHR
  4.    ΔHA + ΔHR
 Discuss Question
Answer: Option C. -> E + ΔHA - ΔHR

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