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MCQs

Total Questions : 2307 | Page 23 of 231 pages
Question 221. For a __________ order reaction, the units of rate constant and rate of reaction are the same.
  1.    Zero
  2.    First
  3.    Second
  4.    Fractional
 Discuss Question
Answer: Option A. -> Zero
Question 222. When the reaction is dominated by in-traparticle diffusion, the apparent order of reaction (nD) as measured is related to the true order (n) as
  1.    ND = (n + 1)/2
  2.    ND = n/2
  3.    ND = n + 1
  4.    None of these
 Discuss Question
Answer: Option A. -> ND = (n + 1)/2
Question 223. Carbon particles accummulated on the catalyst used in the gas oil cracking lies in the category of __________ poison.
  1.    Deposited
  2.    Chemisorbed
  3.    Selectivity
  4.    Stability
 Discuss Question
Answer: Option A. -> Deposited
Question 224. A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.
  1.    Less than
  2.    Equal to
  3.    More than
  4.    Equal to or more than
 Discuss Question
Answer: Option D. -> Equal to or more than
Question 225. Which of the following is the most suitable for isothermal operation?
  1.    Batch reactor
  2.    Back-mix reactor
  3.    Plug-flow reactor
  4.    Fixed bed reactor
 Discuss Question
Answer: Option B. -> Back-mix reactor
Question 226. BET apparatus
  1.    Measures the catalyst surface area directly
  2.    Operates at very high pressure
  3.    Is made entirely of stainless steel
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 227. In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds.
  1.    Catalytic
  2.    Parallel
  3.    Series
  4.    Auto catalytic
 Discuss Question
Answer: Option D. -> Auto catalytic
Question 228. The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the
  1.    Space time for each parallel line is same
  2.    Space time for parallel lines is different
  3.    Larger reactors have more space time compared to smaller ones
  4.    None of these
 Discuss Question
Answer: Option A. -> Space time for each parallel line is same
Question 229. In the gaseous phase ammonia formation reaction (N₂ + 3H₂ ⇋ 2NH₃), the value of the equilibrium constant depends on the
  1.    Total pressure of the system
  2.    Volume of the reactor
  3.    Temperature
  4.    Initial concentration of N₂ and H₂
 Discuss Question
Answer: Option C. -> Temperature
Question 230. Photochemical reaction rate does not depend significantly on temperature, because
  1.    It is a reversible reaction
  2.    It is an exothermic reaction
  3.    The energy of reacting molecules exceeds the activation energy by absorption of light
  4.    None of these
 Discuss Question
Answer: Option C. -> The energy of reacting molecules exceeds the activation energy by absorption of light

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