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Chemical Reaction Engineering

Chemical Reaction Engineering
In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffacted by pressure changes ?

2O? ? 3O?
2SO? + O? ? 2SO?
2NO? ? N?O?
N? + O? ? 2NO

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Chemical Reaction Engineering
Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed by pore diffusion) Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus)

Tan hT/tan T
Tan hT/T
None of these
Tan T/T

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Chemical Reaction Engineering
BET apparatus

Is made entirely of stainless steel
Measures the catalyst surface area directly
None of these
Operates at very high pressure

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

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

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

Zero order
None of these
Third order
Consecutive

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Chemical Reaction Engineering
A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be

τ/0.693
0.693τ
0.5τ
2τ

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