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Chemical Reaction Engineering

Chemical Reaction Engineering
The conversion for a first order liquid phase reaction. A → B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be

60
75
90
100

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

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

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Chemical Reaction Engineering
If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is

2
3
1

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Chemical Reaction Engineering
Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction.

Consecutive
Zero order
None of these
Third order

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Chemical Reaction Engineering
Space time equals the mean residence time

For CSTR
For narrow diameter tubular reactor
When the density of the reaction mixture is constant
For large diameter tubular reactor

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Chemical Reaction Engineering
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by

keff = (kkg)1/2
keff = k + kg
1/keff = 1/k + 1/kg
keff = (k+ kg)/2

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