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

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bSeries

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cSeries-parallel

✓


dNone of these

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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

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bIII, II, I

✓


cIII, I, II

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dII, III, I

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View Answer III, II, I

Which of the following will give maximum gas conversion ?


aFixed bed reactor

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bFluidised bed reactor

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cSemi-fluidised bed reactor

✓


dPlug-flow catalytic reactor

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Threshold energy in a reaction is equal to the_________________?


aActivation energy

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bNormal energy of reactants

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cSum of A. & B.

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dNeither A. nor B.

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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

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cCA . K1/2

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dCA . K2/2

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View Answer CA (K1 + K2)

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


aIncreases

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bDecreases

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cRemains unchanged

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dUnpredictable from the data

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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

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

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cBoth the conversion as well as concentrations will be different

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dNone of these

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


aFluidised bed reactor

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bMoving bed reactor

✓


cFixed bed reactor

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dNone of these

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View Answer Moving bed reactor

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


a∝ CA

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b∝ 1/CA

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cIndependent of temperature

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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

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bVolume of the reaction vessel

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cNature of the reactants

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dMolar concentration of the reactants

✓



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