For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1 min-1 . What will be the conversion for a PFR with a space velocity of 0.2 min-1 ?
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Molecularity of an elementary reaction, P + Q → R + S is
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The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is
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A catalyst in a chemical reaction
A. Decreases the activation energy
B. Alters the reaction mechanism
C. Increases the frequency of collisions of reacting species
D. All of the above
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For a __________ order reaction, the units of rate constant and rate of reaction are the same.
A. Zero
B. First
C. Second
D. Fractional
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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
A. n D = 2 n + 1
B. n D = 2 n
C. n D = n + 1
D. None of these
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Carbon particles accummulated on the catalyst used in the gas oil cracking lies in the category of __________ poison.
A. Deposited
B. Chemisorbed
C. Selectivity
D. Stability
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A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.
A. Less than
B. Equal to
C. More than
D. Equal to or more than
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BET apparatus
A. Measures the catalyst surface area directly
B. Operates at very high pressure
C. Is made entirely of stainless steel
D. None of these
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Which of the following is the most suitable for isothermal operation?
A. Batch reactor
B. Back-mix reactor
C. Plug-flow reactor
D. Fixed bed reactor
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In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds.
A. Catalytic
B. Parallel
C. Series
D. Auto catalytic
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In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇋ 2NH3 ), the value of the equilibrium constant depends on the
A. Total pressure of the system
B. Volume of the reactor
C. Temperature
D. Initial concentration of N2 and H2
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The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the
A. Space time for each parallel line is same
B. Space time for parallel lines is different
C. Larger reactors have more space time compared to smaller ones
D. None of these
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Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed by pore diffusion) Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus)
A. Tan hT/T
B. Tan T/T
C. Tan hT/tan T
D. None of these
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Photochemical reaction rate does not depend significantly on temperature, because
A. It is a reversible reaction
B. It is an exothermic reaction
C. The energy of reacting molecules exceeds the activation energy by absorption of light
D. None of these
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The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.
A. Autocatalytic
B. Exothermic
C. Endothermic
D. Autothermal
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With increase in temperature, the equilibrium __________ rises in case of endothermic reaction.
A. Constant
B. Conversion
C. Both A & B
D. Neither A nor B
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Catalyst carriers
A. Have very high selectivity
B. Increase the activity of a catalyst
C. Provide large surface area with a small amount of active material
D. Inhibit catalyst poisoning
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The use of space time is preferred over the mean residence time in the design of a/an
A. Batch reactor
B. Ideal tubular-flow reactor
C. Slurry reactor
D. CSTR
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A high space velocity means that a given
A. Reaction can be accomplished with small reactor
B. Conversion can be obtained with a high feed rate
C. Both A and B
D. None of these
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