Chemical Engineering MCQs

Page No. 562

In a chemical reaction as shown in the bellow figure, it is observed that the (i) Rate of formation of ‘P’ is doubled on doubling the concentration of ‘X’ (ii) Rate of formation of ‘P’ is quadrupled on doubling the concentration of ‘Y’ (iii) Doubling the concentration of ‘Z’ does not affect the rate of formation of ‘P’ What is the order of the above chemical reaction ?


aZeroth order


bFirst order


cSecond order


dThird order


View Answer Third order

With an increase in pressure in gaseous phase chemical reactions, the fractional conversion ______________ when the number of moles decreases?


aIncreases


bDecreases


cRemain unaffected


dUnpredictable from the data


View Answer Increases

A liquid phase reaction is to be carried out under isothermal conditions. The reaction rate as a function of conversion has been determined experimentally and is shown in the figure given below. What choice of reactor or combination of reactors will require the minimum overall reactor volume, if a conversion of 0.9 is desired ?


aCSTR followed by a PFR


bPFR followed by a CSTR


cCSTR followed by a PFR followed by a CSTR


dPFR followed by a CSTR followed by a PFR



What is the order of chemical reaction as shown in the bellow figure, if it is found that the reaction rate doubles on doubling the concentration of B and also the reaction rate doubles when the concentrations of both A & B were doubled and quadrupled when the concentrations of both B & C were doubled ?


a1


b2


c3


d4


View Answer 2

For the reaction, A + B → 2B + C,___________________?


arA = rB


brA = -rB


crA = 2rB


drA = rB/2


View Answer rA = -rB

The reaction rate constants at two different temperatures T1 and T2 are related by _________________?


aln (k2/k1) = (E/R) (1/T2 – 1/T1)


bln (k2/k1) = (E/R) (1/T1 – 1/T2)


cexp (k2/k1) = (E/R) (1/T2 – 1/T1)


dexp (k2/k1) = (E/R) (1/T1 – 1/T2)



The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is _____________________ that of mixed reactor?


aGreater than


bEqual to


cSmaller than


dUnpredictable from the data


View Answer Smaller than

For the liquid phase parallel reactions__________________? R, rR = K1.CA2; E1 = 80 KJ/mole S, rs = K1.CA ; E2 = 120 KJ/mole The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted at


aLow temperature in a CSTR


bHigh temperature in a CSTR


cLow temperature in a PFR


dHigh temperature in a PFR



Organic catalysts differ from the inorganic catalyst in the sense that the former is________________?


aActive at cryogenic temperatures only


bProhibitively costly


cProteinous in nature


dActive at very high temperature only


View Answer Proteinous in nature

For the gaseous reaction 2A → B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is___________________?


a1


b-0.5


c-0.25


d0


View Answer 0.25

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