Chemical Engineering MCQs

Page No. 547

For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to 1/4th of its initial volume, then the rate of reaction compared to the original rate will be ______________ times?


a8


b16


c1/8


d1/16


View Answer 16

The effect of increasing pressure on the gaseous equilibrium of the reaction 2X + 3Y ⇌ 3X + 2Y indicates that____________________?


aPressure has no effect


bBackward reaction is favoured


cForward reaction is favoured


dNone of these



Signal normally used to study non-ideal flow by stimulus response technique is _______________ input?


aPulse


bStep


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenius law is used. What will be this ratio, if transition state theory is used with the same value of „E/R‟ ?


a1.6


b2


c2.24


d2.5


View Answer 2.5

Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as_________________?


aDE = DM + DK


b1/DE = 1/DN + DK


cDE = DM . DE


dDE = DN/DE


View Answer 1/DE = 1/DN + DK

Which of the following is not a chemical step in a fluid solid catalytic reaction ?


aSurface chemical reaction


bAdsorption


cDesorption


dNone of these


View Answer None of these

In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will________________?


aRemain the same


bBe halved


cAlso be doubled


dBecome one fourth


View Answer Remain the same

Catalyst carriers___________________?


aHave very high selectivity


bIncrease the activity of a catalyst


cProvide large surface area with a small amount of active material


dInhibit catalyst poisoning



Rate determining step in a reaction consisting of a number of steps in series is the ______________ step?


aFastest


bSlowest


cIntermediate


dData insufficient; can’t be predicted


View Answer Slowest

____________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction ?


aGas film diffusion


bAsh diffusion


cChemical reaction


dNone of these


View Answer Chemical reaction

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