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MCQs

Total Questions : 2307 | Page 3 of 231 pages
Question 21. The reason why a catalyst increases the rate of reaction is that, it
  1.    Decreases the energy barrier for reaction
  2.    Increases the activation energy
  3.    Decreases the molecular collision diameter
  4.    None of these
 Discuss Question
Answer: Option A. -> Decreases the energy barrier for reaction
Question 22. A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length
  1.    Decreases
  2.    Increases
  3.    Is at the highest allowable temperature throughout
  4.    First increases and then decreases
 Discuss Question
Answer: Option C. -> Is at the highest allowable temperature throughout
Question 23. __________ catalytic reaction is involved in the thermal cracking of gas oil.
  1.    Homogeneous
  2.    Homogeneous non
  3.    Heterogeneous
  4.    Heterogeneous non
 Discuss Question
Answer: Option A. -> Homogeneous
Question 24. In the reversible reaction of the type, A + B ⇋ AB, in general
  1.    Both forward and backward reactions will be exothermic
  2.    Neither of the reactions will be en-dothermic
  3.    The combination reaction will be exothermic, while the dissociation reaction will be endothermic
  4.    The combination reaction will be endothermic, while the dissociation reaction will be exothermic
 Discuss Question
Answer: Option C. -> The combination reaction will be exothermic, while the dissociation reaction will be endothermic
Question 25. A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is __________ seconds.
  1.    1
  2.    3
  3.    1/3
  4.    32
 Discuss Question
Answer: Option B. -> 3
Question 26. Which of the following is not a dimension-less group used in catalysis ? (where, D = dispersion co-efficient, cm² /sec.D1 = diffusion co-efficient; cm²/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm³/sec . V = volume, cm³.)
  1.    Reactor dispersion number (D/vL)
  2.    Reduced time (vt/V)
  3.    Thiele modulus (L√(k/D1)
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 27. Given, 3H₂ + CO = CH₄ + H₂O, KP = 101.84 and, 4H₂ + CO₂ = CH₄ + 2H₂O, KP = 101.17the KP for the reaction CO + H₂O = CO₂ + H₂ is
  1.    103.01
  2.    10-0.67
  3.    10-3.01
  4.    L00.67
 Discuss Question
Answer: Option D. -> L00.67
Question 28. Holding time for flow reactors is __________ the space time, for constant fluid density
  1.    Double
  2.    Triple
  3.    Equal to
  4.    None of these
 Discuss Question
Answer: Option C. -> Equal to
Question 29. Rate of a chemical reaction is not affected by the
  1.    Catalyst
  2.    Temperature
  3.    Reactant's concentration
  4.    Number of molecules of reactants taking part in the reaction
 Discuss Question
Answer: Option D. -> Number of molecules of reactants taking part in the reaction
Question 30. Semibatch reactor is preferred, when a/an
  1.    A highly exothermic reaction is to be controlled
  2.    Undersirable side reaction (at high concentration of one of the reactants) is to be avoided
  3.    A gas is to be reacted with liquid (e.g. hydrogenation of fat)
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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