Chemical Engineering MCQs

Page No. 551

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


aEquilibrium constant

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bActivation energy

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cFinal products

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dHeat of reaction

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View Answer Activation energy

Slurry reactors are characterised by the_________________?


aLack of intraparticle diffusion resistance

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bPresence of two mobile phases

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

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


aMaxima in the concentration of A

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bMaxima in the concentration of B

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cMaxima in the concentration of C

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dHigh exothermicity

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A multiple reaction may be classified as a ________________ reaction?


aConsecutive or side

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bParallel or side

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cMixed

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dAll A., B. and C.

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View Answer All A., B. and C.

Molecularity of a reaction__________________?


aIs always equal to the overall order of reaction

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bMay not be equal to the order of reaction

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cCan’t have a fractional value

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dBoth B. and C.

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View Answer Both B. and C.

A balanced chemical reaction equation conforms to the law of________________?


aConservation of mass

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bAvogadro’s hypothesis

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cGaseous volumes

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dNone of these

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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

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bSaliva

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cIntestine

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dGland

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View Answer Saliva

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


a2HI ⇌ H2 + I2

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bN2O2 ⇌ 2NO2

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cN2 + O2 ⇌ 2NO

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dNone of these

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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

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b1.33

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c1.60

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d2.67

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View Answer 1.60

Pick out the wrong statement ?


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

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

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cSlow chemical reactions have generally high values of activation energy

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

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