Chemical Reaction MCQs

188 MCQs — Chemical Engineering MCQs (Page 8 of 19)

Attempt Chemical Reaction Quiz

Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about _______________ minutes?

A. 3
B. 4
C. 6
D. 10

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The concentration of A in a first order reaction, A → B, decreases_____________________?

A. Linearly with time
B. Exponentially with time
C. Very abruptly towards the end of the reaction
D. Logarithmically with time

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‘n’ number of plug flow reactors (P.F.R) in series with a total volume ‘V’ gives the same conversion as one P.F.R. of volume________________?

A. V/n
B. V
C. V.n
D. 1/v

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Half life period of a chemical reaction is proportional to CA0 -1, if the reaction is of _______________ order?

A. First
B. Zero
C. Second
D. Third

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B.E.T. method of finding out surface area of a catalyst, uses the extension of _________________ isotherm?

A. Langmuir
B. Freundlich
C. Tempkin
D. None of these

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Vegetable oils are hydrogenated in a _______________ reactor?

A. Slurry
B. Plug flow
C. Homogeneous catalytic
D. None of these

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In the hydrodealkylation of toluene to benzene, the following reactions occur: C7H8 + H2 → C6H6 + CH4 2C6H6 ⇌ C12H10 + H2 Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is_______________________?

A. 0.16
B. 0.144
C. 0.152
D. 0.136

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Promoter_____________________?

A. Initiates a chemical reaction and is a catalyst by itself
B. Alters the position of equilibrium in a reversible reaction
C. Increases the number of active centres by increasing the unevenness of catalyst surface and by
CreAting discontinuities in the crystals

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In an ideal P.F.R. at steady state conditions ___________________?

A. The composition of reactants remains constant along a flow path
B. The conversion of the reactant varies from point to point along a flow path
C. There is no lateral mixing of fluid
D. There may be diffusion along the flow path

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The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the_________________?

A. Increased temperature reduces the activation energy
B. Fraction of molecules having threshold energy increases
C. Collision frequency increases
D. Value of threshold energy decreases

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