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MCQs

Total Questions : 2307 | Page 25 of 231 pages
Question 241. With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases.
  1.    Increases
  2.    Decreases
  3.    Remains unaffected
  4.    Unpredictable from the data
 Discuss Question
Answer: Option A. -> Increases
Question 242. The rate of forward reaction, at chemical equilibrium is____the rate of backward reaction.
  1.    More than
  2.    Less than
  3.    Equal to
  4.    Either B or C
 Discuss Question
Answer: Option C. -> Equal to
Question 243. An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is
  1.    Maximum at the inlet of the reactor
  2.    Maximum at the exit of the reactor
  3.    Maximum at the centre of the reactor
  4.    Constant throughout the reactor
 Discuss Question
Answer: Option A. -> Maximum at the inlet of the reactor
Question 244. In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO₂ to SO₃ is accomplished by a __________ reaction.
  1.    Non-catalytic homogeneous
  2.    Non-catalytic heterogeneous
  3.    Catalytic homogenous
  4.    Catalytic heterogeneous
 Discuss Question
Answer: Option C. -> Catalytic homogenous
Question 245. Pick out the wrong statement.
  1.    Visible radiation provides the necessary activation energy in photochemical reactions
  2.    The order and molecularity of a complex reaction may not be the same
  3.    For a second order reaction, the slope of the graph/plot between rate and (concentration) is equal to the rate constant (k)
  4.    Molecularity of the reaction is always a whole number greater than zero
 Discuss Question
Answer: Option B. -> The order and molecularity of a complex reaction may not be the same
Question 246. For the chemical reaction X → Y, it is observed that, on doubling the concentration of 'X', the reaction rate quadruples. If the reaction rate is proportional to Cxn, then what is the value of 'n' ?
  1.    4
  2.    1/4
  3.    16
  4.    2
 Discuss Question
Answer: Option A. -> 4
Question 247. Which of the following is not a theory of homogeneous reaction?
  1.    Collision theory and activated complex theory
  2.    Chain reaction theory
  3.    Radiation hypothesis
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 248. Rate of an autocatalytic chemical reaction is a function of
  1.    Temperature only
  2.    Pressure only
  3.    Composition only
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 249. The role of a catalyst in a chemical reaction is to change the
  1.    Equilibrium constant
  2.    Activation energy
  3.    Final products
  4.    Heat of reaction
 Discuss Question
Answer: Option B. -> Activation energy
Question 250. A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes.
  1.    4
  2.    8
  3.    12
  4.    16
 Discuss Question
Answer: Option D. -> 16

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