Chemical Engineering MCQs

Page No. 551

The role of a catalyst in a chemical reaction is to change the__________________?


aEquilibrium constant


bActivation energy


cFinal products


dHeat of reaction


View Answer Activation energy

Slurry reactors are characterised by the_________________?


aLack of intraparticle diffusion resistance


bPresence of two mobile phases


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

consecutive reaction, as shown in the bellow figure, is characterised by __________________?


aMaxima in the concentration of A


bMaxima in the concentration of B


cMaxima in the concentration of C


dHigh exothermicity



A multiple reaction may be classified as a ________________ reaction?


aConsecutive or side


bParallel or side


cMixed


dAll A., B. and C.


View Answer All A., B. and C.

Molecularity of a reaction__________________?


aIs always equal to the overall order of reaction


bMay not be equal to the order of reaction


cCan’t have a fractional value


dBoth B. and C.


View Answer Both B. and C.

A balanced chemical reaction equation conforms to the law of________________?


aConservation of mass


bAvogadro’s hypothesis


cGaseous volumes


dNone of these


View Answer Conservation of mass

Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in ___________________?


aBlood


bSaliva


cIntestine


dGland


View Answer Saliva

Which of the following chemical reactions will be favoured by low pressure ?


a2HI ⇌ H2 + I2


bN2O2 ⇌ 2NO2


cN2 + O2 ⇌ 2NO


dNone of these


View Answer N2O2 ⇌ 2NO2

An isothermal aqueous phase reversible reaction, P ⇌ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP – 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is_________________?


a0.80


b1.33


c1.60


d2.67


View Answer 1.60

Pick out the wrong statement ?


aIn a multistep reaction, the slowest step is the rate determining step


bIn general, the rate of a reaction becomes triple for every 10°C rise in temperature


cSlow chemical reactions have generally high values of activation energy


dMolecularity of a reaction cannot be zero but the order of a reaction can be zero



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