For the liquid phase parallel reactions:R = K1 .CA2 ; E1 = 80 KJ/moleS = K1 .CA ; E2 = 120 KJ/mole
A. Low temperature in a CSTR
B. High temperature in a CSTR
C. Low temperature in a PFR
D. High temperature in a PFR
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Which of the following is a controlling factor in very fast heterogeneous reaction?
A. Heat and mass transfer effects
B. Pressure
C. Temperature
D. Composition of reactant
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The catalytic converter for conversion of SO2 to SO3 by contact process should have a feed with SO2 content between
A. 2 - 5%
B. 7 - 10%
C. 12 - 15%
D. 20 - 25%
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In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffacted by pressure changes ?
A. 2 O 3 ⇌ 3 O 2
B. N 2 + O 2 ⇌ 2 NO
C. 2 N O 2 ⇌ N 2 O 4
D. 2 S O 2 + O 2 ⇌ 2 S O 3
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A multiple reaction may be classified as a __________ reaction.
A. Consecutive or side
B. Parallel or side
C. Mixed
D. All of the above
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The single parameter model proposed for describing non-ideal flow is the __________ model.
A. Tank in series
B. Dispersion
C. Both A & B
D. Neither A nor B
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Pick out the wrong statement.
A. 'Hold back' is defined as the fraction of material that stays longer than the mean residence time
B. Study of non-ideal flow reactor is done experimentally by stimulus-response technique
C. For studying a chemical reaction, it is desirable to monitor the reactants during initial stages and the products during the final stages of reaction
D. A batch reactor can not be used to study the kinetics of catalytic reaction
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The exit age distribution of fluid leaving a vessel is used to know the
A. Activation energies of a reaction
B. Reaction mechanism
C. Extent of non-ideal flow in the vessel
D. None of these
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In case of staged packed bed reactors carrying out exothermic reaction, use
A. High recycle for pure gas
B. Plug flow for dilute liquid requiring no large preheating of feed
C. Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature
D. All of the above
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The rate expression for a heterogenous catalytic reaction is given by, - rA = K.KA PA (1 + KA .PA + Kr .PR ), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA ), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A)
A. E
B. E + ΔHA
C. E + ΔHA - ΔHR
D. ΔHA + ΔHR
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In Langmuir treatment of adsorption,
A. Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule
B. Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site
C. All the adsorption does not take place by the same mechanism
D. Extent of adsorption is more than one complete monomolecular layer on the surface
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If CA is the quantity of reactants initially present, the quantity left after 'n' half periods will be equal to
A. ( 2 C A ) n
B. ( 2 1 ) n ⋅ C A
C. ( 2 C A ) n 1
D. ( C A ) 2 n 1
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Pick out the correct statement.
A. A catalyst does not change AH of the reaction
B. A catalyst changes the equilibrium point
C. Law of mass action was suggested by Le-Chatelier
D. The difference between the energy of reactants and that of the products is the activation energy
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Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature.
A. Higher
B. Much higher
C. Lower
D. Much lower
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With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases.
A. Increases
B. Decreases
C. Remains unaffected
D. Unpredictable from the data
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The rate of forward reaction, at chemical equilibrium is____the rate of backward reaction.
A. More than
B. Less than
C. Equal to
D. Either B or C
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An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is
A. Maximum at the inlet of the reactor
B. Maximum at the exit of the reactor
C. Maximum at the centre of the reactor
D. Constant throughout the reactor
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In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a __________ reaction.
A. Non-catalytic homogeneous
B. Non-catalytic heterogeneous
C. Catalytic homogenous
D. Catalytic heterogeneous
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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 Cx n , then what is the value of 'n'?
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Pick out the wrong statement.
A. Visible radiation provides the necessary activation energy in photochemical reactions
B. The order and molecularity of a complex reaction may not be the same
C. For a second order reaction, the slope of the graph/plot between rate and (concentration) is equal to the rate constant (k)
D. Molecularity of the reaction is always a whole number greater than zero
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