Chemical Engineering MCQs

Page No. 348

Pick out the wrong statement?


aExit age description function E. and internal age distribution function (I) are related as, E = -(dI/dθ)

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bChemisorption studies are useful in the determination of catalyst surface area and pore size distribution

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cA higher temperature favours the reaction of higher activation energy

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dA catalyst increases the potential energy barrier over which the reactants must pass to form products

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View Answer A catalyst increases the potential energy barrier over which the reactants must pass to form products

Pick out the wrong statement?


aUse of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition

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bAlumina is added as a promoter to iron catalyst in ammonia synthesis reaction

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cActivation energy for a reaction is obtained from the intercept of the Arrhenius plot

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dPresence of inerts affects the equilibrium conversion of

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View Answer Activation energy for a reaction is obtained from the intercept of the Arrhenius plot

Pick out the wrong statement?


aA particular chemical reaction is more temperature sensitive at low temperatures

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bA very high value of equilibrium constant, K (K >> 1) indicates that the reaction is practically irreversible in nature

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cThe intercept of the Arrhenius plot is called the ‘activation energy’

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dNon-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant regions

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View Answer The intercept of the Arrhenius plot is called the ‘activation energy’

Pick out the correct statement?


aA lower temperature favours the reaction of lower activation energy

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bThe dispersion number for a reactor/vessel is uL/D

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cThe rate controlling step in a reaction involving many steps is the fastest step

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dPore volume and porosity of a catalyst is measured by Brunauer-Emmett-Teller (BET) technique

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View Answer A lower temperature favours the reaction of lower activation energy

Pick out the wrong statement ?


aIn a batch reactor, which is exclusively used for liquid phase reactions; temperature pressure and composition may vary with time

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bIn a semi-batch reactor, one reactant is charged batch wise, while the other reactant is fed continuously

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cIn a continuous flow reactor, uniform concentration cannot be maintained throughout the vessel even in a well agitated system

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dIn a continuous flow reactor, both the reactants and the products flow out continuously

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View Answer In a continuous flow reactor, uniform concentration cannot be maintained throughout the vessel even in a well agitated system

Pick out the wrong statement?


aThe integral method of analysing kinetic data is used when the data is scattered

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bThe differential method of analysing kinetic data requires more accurate or larger amounts of data

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cWhen the reaction rate is independent of temperature, the reaction is said to be of zero order

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dThe ratio of volumes of plug flow reactor to that of mixed reactor is always less than one for identical feed composition, flow rate, conversion and for all positive reaction orders

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View Answer When the reaction rate is independent of temperature, the reaction is said to be of zero order

Pick out the correct statement?


aReactions with high activation energies are very temperature sensitive

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bChemical equilibrium is a static state

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cA photochemical reaction is catalysed by light

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dA chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction

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View Answer Reactions with high activation energies are very temperature sensitive

Pick out the wrong statement ?


aChemical reactions with high activation energy are very temperature sensitive

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bA flat velocity profile exists in a plug flow reactor

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cThe residence time for all the elements of fluid in case of a P.F.R. need not be same

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dHalf life of a reaction increases with increased initial concentration for reaction orders more than one

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View Answer The residence time for all the elements of fluid in case of a P.F.R. need not be same

Pick out the wrong statement ?


aA pale color of petroleum product indicates lower viscosity

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bColor of petroleum products indicates the degree of refinement

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cLighter petroleum distillates are lighter in color than the heavier residual oils

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dFluorescence of oils helps to detect its adulteration

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View Answer A pale color of petroleum product indicates lower viscosity

Pick out the wrong statement?


aHigher temperature is employed in visbreaking than in thermal cracking

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bPyrolysis is a mild thermal cracking process

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cLead susceptibility of petrol produced by catalytic process is more than that produced by thermal cracking

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dOperating pressure and temperature in thermal cracking process is more than that in catalytic cracking process

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View Answer Higher temperature is employed in visbreaking than in thermal cracking

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