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Chemical Reaction Engineering

Chemical Reaction Engineering
The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called

None of these
Operational yield
Relative yield
Selectivity

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Chemical Reaction Engineering
Knudsen diffusion is directly proportional to

1/√T
T₂
√T
T

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Chemical Reaction Engineering
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.

Either A, B or C
Chemical reaction
Diffusion through ash layer
Film diffusion

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Chemical Reaction Engineering
If the rate of a chemical reaction becomes slower at a given temperature, then the

Free energy of activation is lower
Free energy of activation is higher
Entropy changes
Initial concentration of the reactants remains constant

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Chemical Reaction Engineering
In the hydrodealkylation of toluene to benzene, the following reactions occur:C₇H₈ + H₂ → C₆H₆ + CH₄2C₆H₆ ⇋ C₁₂H₁₀ + H₂Toluene 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

0.144
0.136
0.16
0.152

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Chemical Reaction Engineering
A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are

Of different sizes
Of such size that the ratio of their volumes is < 5
Equal in size
None of these

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