Which of the following is not a unit of reaction rate?
A. Moles for med/(surface of catalyst) (time)
B. Moles formed/volume of reactor) (time)
C. Mole formed/volume of catalyst) (time)
D. None of these
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Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
A. Proportional to
B. Independent of
C. Inversely proportional to
D. Proportional to the square of
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Conversion increases with increase in temperature in case of a an __________ reaction.
A. Autocatalytic
B. Irreversible
C. Reversible endothermic
D. Reversible exothermic
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Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes.
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What is the value of 'n' if the reaction rate of the chemical reaction A → B, is proportional to CA n and it is found that the reaction rate triples, when the concentration of 'A' is increased 9 times?
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There is no correspondence between stoichiometry and the rate equation in case of a/an __________ reaction.
A. Elementary
B. Multiple
C. Autocatalytic
D. Non-elementary
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For a zero order reaction, the concentration of product increases with the
A. Increase of reaction time
B. Increase in initial concentration
C. Total pressure
D. Decrease in total pressure
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The conversion for a first order liquid phase reaction. A → B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be
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The rate constant of a first order reaction depends on the
A. Concentration of the reactant
B. Temperature
C. Concentration of the product
D. Time
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For all positive reaction orders for a particular duty,
A. Mixed reactor is always larger than the plug-flow reactor
B. Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order
C. Reactor size is independent of the type of flow
D. Density variation during reaction affects design
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If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.
A. t ∝ a n 1
B. t ∝ a n − 1 1
C. t ∝ a n + 1 1
D. t ∝ a n
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In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for
A. Fast reactions in catalyst of small pore diameter
B. Fast reaction in catalyst of large pore diameter
C. Slow reactions in catalyst of small pore diameter
D. Slow reactions in catalyst of large pore diameter
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For a mixed flow reactor operating at steady state, the rate of reaction is given by
A. V F A 0 − dt d C A
B. V F A 0 + dt d C A
C. V F A 0 ⋅ X A
D. − dt d C A
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The catalyst in a second order reversible reaction increases the rate of the forward reaction
A. And decreases that of backward reaction
B. And backward reaction equally
C. Only
D. To a greater extent than that of the backward reaction
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A photochemical reaction is __________ light.
A. Initiated by
B. Accompanied with emission of
C. Catalysed by
D. Used to convert heat energy into
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The rate constant of a reaction is a function of the
A. Time of reaction
B. Temperature of the system
C. Extent of reaction
D. Initial concentration of the reactants
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With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will
A. Increase
B. Decrease
C. Remain same
D. Data in insufficient; can't be predicted
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The rate at which a chemical substance reacts is proportional to its
A. Active mass
B. Equivalent weight
C. Molecular weight
D. None of these
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The rate at which a chemical substance reacts is proportional to its
A. Active mass
B. Molecular weight
C. Equivalent weight
D. Atomic weight
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A first order reaction requires two equal sized CSTR. The conversion is
A. Less when they are connected in series
B. More when they are connected in series
C. More when they are connected in parallel
D. Same whether they are connected in series or in parallel
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