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Chemical Reaction Engineering

Chemical Reaction Engineering
If Thiele modulus is __________ , then the pore diffusion resistance in a catalyst may be considered as negligible.

> 0.5
0
∞
< 0.5

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Chemical Reaction Engineering
Reaction rate of a first order reaction, which is half completed in 23 minutes will be

0.03 hr⁻¹
0.05 min⁻¹
0.03 sec⁻¹
0.03 min⁻¹

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Chemical Reaction Engineering
The rate constant of a reaction depends on the

Temperature of the system
Extent of reaction
Initial concentration of reactants
Time of reaction

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Chemical Reaction Engineering
If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.

T ∝ 1/an + 1
T ∝ 1/an
T ∝ an
T ∝ 1/an - 1

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Chemical Reaction Engineering
The increase in the rate of reaction with temperature is due to

Increase in the average kinetic energy of the reacting molecules
Decrease in activation energy
Increase in the number of effective collisions
None of these

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Chemical Reaction Engineering
A catalyst is said to be a negative catalyst, ifit

Does not initiate the reaction
All of these
Retards the rate of reaction
Reduces the value of equilibrium constant

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