Chemical Engineering MCQs

Page No. 561

A non-catalytic chemical reaction of the type as shown in the bellow figure is called a _____________ reaction?


aParallel


bSeries


cSeries-parallel


dNone of these


View Answer Series-parallel

A first order homogeneous reaction of the type X → Y → Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time ?


aI, II, III


bIII, II, I


cIII, I, II


dII, III, I


View Answer III, II, I

Which of the following will give maximum gas conversion ?


aFixed bed reactor


bFluidised bed reactor


cSemi-fluidised bed reactor


dPlug-flow catalytic reactor



Threshold energy in a reaction is equal to the_________________?


aActivation energy


bNormal energy of reactants


cSum of A. & B.


dNeither A. nor B.


View Answer Sum of A. & B.

For the irreversible elementary reactions in parallel as shown in the bellow figure, the rate of disappearance of ‘X’ is equal to_______________?


aCA (K1 + K2)


bCA (K1 + K2)/2


cCA . K1/2


dCA . K2/2


View Answer CA (K1 + K2)

Fractional conversion _____________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 ⇌ 2NH3?


aIncreases


bDecreases


cRemains unchanged


dUnpredictable from the data


View Answer Increases

A first order irreversible reaction, A → B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that _____________ in the two reactors?


aBoth conversion as well as concentration are same


bConversion in both will be the same but concentrations will be different


cBoth the conversion as well as concentrations will be different


dNone of these



Which of the following is used for calcination of limestone and dolomite in industrial practice?


aFluidised bed reactor


bMoving bed reactor


cFixed bed reactor


dNone of these


View Answer Moving bed reactor

A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant) ?


a∝ CA


b∝ 1/CA


cIndependent of temperature


dNone of these


View Answer None of these

According to the ‘law of mass action’, the rate of reaction is directly proportional to the__________________?


aEquilibrium constant


bVolume of the reaction vessel


cNature of the reactants


dMolar concentration of the reactants



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