Chemical Engineering MCQs

Page No. 347

Pick out the correct statement ?


aA catalyst does not change AH of the reaction

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bA catalyst changes the equilibrium point

✓


cLaw of mass action was suggested by Le-Chatelier

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dThe difference between the energy of reactants and that of the products is the activation energy

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View Answer A catalyst changes the equilibrium point

Pick out the wrong statement ?


aAutocatalytic reactions are exemplified by microbial fermentation reactions

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bThe slowest step has the greatest influence on the overall reaction rate in case of an irreversible series reaction

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cThe fractional conversion at any time is same for both the constant as well as the variable volume system in case of an irreversible unimolecular type first order reaction

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dHydrolysis of ester in presence of alkali or acid is a zero order reaction

✓


View Answer Hydrolysis of ester in presence of alkali or acid is a zero order reaction

Pick out the wrong statement ?


aVisible radiation provides the necessary activation energy in photochemical reactions

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bThe order and molecularity of a complex reaction may not be the same

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cFor a second order reaction, the slope of the graph/plot between rate and (concentration) is equal to the rate constant (k)

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dMolecularity of the reaction is always a whole number greater than zero

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View Answer The order and molecularity of a complex reaction may not be the same

Pick out the wrong statement ?


aA catalyst does not alter the final position of equilibrium in a reversible reaction

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bA catalyst initiates a reaction

✓


cA catalyst is specific in reaction

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dA catalyst remains unchanged in chemical composition at the end the reaction

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View Answer A catalyst initiates a reaction

Pick out the wrong statement?


aIn a first order reaction, A → products; the reaction becomes slower as it proceeds, because the concentration of A decreases and the rate is proportional to the concentration of A

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bTransition state theory approaches the problem of calculating reaction rates by concentrating on the idea of activated complexes

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cAccording to the penetration theory, the mass transfer co-efficient decreases, if the exposure time of an eddy to the solute decreases

✓


dIf the rate of an irreversible reaction, A + B → 2C is k.CA.CB, then the reaction is always elementary

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View Answer According to the penetration theory, the mass transfer co-efficient decreases, if the exposure time of an eddy to the solute decreases

Pick out the wrong statement ?


a‘Hold back’ is defined as the fraction of material that stays longer than the mean residence time

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bStudy of non-ideal flow reactor is done experimentally by stimulus-response technique

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cFor studying a chemical reaction, it is desirable to monitor the reactants during initial stages and the products during the final stages of reaction

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dA batch reactor cannot be used to study the kinetics of catalytic reaction

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View Answer A batch reactor cannot be used to study the kinetics of catalytic reaction

Pick out the wrong statement pertaining to space velocity of flow reactors?


aThe unit of space velocity is (time)-1

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bThe space velocity of 3 hr-1 means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour

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cThe space velocity of 3 hr-1 means that one third reactor volume of feed at specified conditions are being fed into the reactor

✓


dNone of these

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View Answer The space velocity of 3 hr-1 means that one third reactor volume of feed at specified conditions are being fed into the reactor

Pick out the correct statement?


aIn catalytic reactions, the catalyst reacts with the reactants

✓


bA catalyst initiates a chemical reaction

✖


cA catalyst lowers the activation energy of the reacting molecules

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dA catalyst cannot be recovered chemically unchanged at the end of the chemical reaction

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View Answer In catalytic reactions, the catalyst reacts with the reactants

Pick out the wrong statement?


aCatalytic activity of enzyme catalysed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C

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bMost of the enzyme catalysed reactions involve at least two substrates

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cEnzymes help in increasing the activation energy of the reaction

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dEquilibrium concentrations in enzyme catalysed reactions can be calculated by using the thermodynamic properties of substrates & products

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View Answer Enzymes help in increasing the activation energy of the reaction

Pick out the wrong statement ?


aThe vessel dispersion number (D/UL) for plug flow and mixed flow approaches zero and infinity respectively

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bSpace time in a flow reactor is a measure of its capacity and is equal to the residence time when the density of reaction mixture is constant

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cMixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty

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dIn an ideal tubular flow reactor, mixing takes place in radial direction and there is no mixing in longitudinal direction

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View Answer Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty

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