Chemical Engineering MCQs

Page No. 559

The irreversible reaction is a special case of reversible reaction, if the________________?


aEquilibrium constant is 1


bConversion of the reactant at equilibrium condition is zero


cReactant concentration at equilibrium condition is zero


dAll A., B. and C.



For multiple reactions, the flow pattern within the vessel affects the ____________________?


aSize requirement


bDistribution of reaction products


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

A catalyst is said to be a negative catalyst, if it ___________________?


aRetards the rate of reaction


bReduces the value of equilibrium constant


cDoes not initiate the reaction


dAll A., B. and C.



The following half life data are available for the irreversible liquid phase reaction A → products. The overall order of reaction is __________________?


a0.5


b1


c1.5


d2


View Answer 1.5

The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the _______________ energy?


aActivation


bPotential


cBinding


dThreshold


View Answer Activation

The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a ‘tanks in series model’ comprising of ‘m’ tanks is equal to ___________________?


am


b1/m


c√m


dm2


View Answer 1/m

If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is _______________?


aZero


bOne


cTwo


dThree


View Answer One

Rate constant ‘k’ and absolute temperature ‘T’ are related by collision theory (for bimolecular) as______________________?


ak ∝ T1.5


bk ∝ exp(-E/RT)


ck ∝ √T


dk ∝ T


View Answer k ∝ √T

A back mix reactor is___________________?


aSuitable for gas phase reactions


bIdeal at very low conversion


cSame as plug flow reactor (PFR)


dSame as ideal stirred tank reactor



The increase in the rate of reaction with temperature is due to__________________?


aIncrease in the number of effective collisions


bDecrease in activation energy


cIncrease in the average kinetic energy of the reacting molecules


dNone of these



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