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Total Questions : 2307 | Page 18 of 231 pages
Question 171. An isothermal irreversible reaction is being carried out in an ideal tubular flow reactor. The conversion in this case will __________ with decrease in space time.
  1.    Increase
  2.    Increase exponentially
  3.    Decrease
  4.    Remain unchanged
 Discuss Question
Answer: Option C. -> Decrease
Question 172. If helium is introduced in a reactor containing O₂, SO₂ and SO₃ at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO₃ (as per Le Chatlier principle)
  1.    Decreases
  2.    Increases
  3.    Remains unaltered
  4.    Changes unpredictably
 Discuss Question
Answer: Option A. -> Decreases
Question 173. The temperature dependence of reaction rate constant (K) by Arhenius law is given by
  1.    K α e-E/RT
  2.    K α eE/RT
  3.    K α T . e-E/RT
  4.    K α √T . e-E/RT
 Discuss Question
Answer: Option A. -> K α e-E/RT
Question 174. Consider the 'n' th order irreversible liquid phase reaction A → B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot?
  1.    CA0 Vs t1/2
  2.    Ln CA0 Vs t1/2
  3.    CA0 Vs ln t1/2
  4.    Ln CA0 Vs ln t1/2
 Discuss Question
Answer: Option C. -> CA0 Vs ln t1/2
Question 175. A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is
  1.    0.33
  2.    0.5
  3.    1
  4.    Data insufficient, can't be predicted
 Discuss Question
Answer: Option C. -> 1
Question 176. For a tubular flow reactor with uniform concentration and temperature, the independent variable is
  1.    Time
  2.    Length
  3.    Diameter
  4.    None of these
 Discuss Question
Answer: Option B. -> Length
Question 177. For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is
  1.    Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase
  2.    Surface reaction between absorbed A and absorbed B
  3.    Surface reaction between A in the gas phase and absorbed B
  4.    Desorption of C
 Discuss Question
Answer: Option D. -> Desorption of C
Question 178. In an ideal P.F.R. at steady state conditions
  1.    The composition of reactants remains constant along a flow path
  2.    The conversion of the reactant varies from point to point along a flow path
  3.    There is no lateral mixing of fluid
  4.    There may be diffusion along the flow path
 Discuss Question
Answer: Option B. -> The conversion of the reactant varies from point to point along a flow path
Question 179. Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k₁/k₂).Csub>Aa-b
  1.    Use high pressure and eliminate inerts, when a > b
  2.    Avoid recycle, when a > b
  3.    Use batch reactor or plug flow reactor, when a > b
  4.    Use CSTR with a high conversion, when a > b
 Discuss Question
Answer: Option B. -> Avoid recycle, when a > b
Question 180. Helium-mercury method can be used to determine the __________ of the catalyst particle.
  1.    Pore volume
  2.    Solid density
  3.    Porosity
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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