Chemical Reaction Engineering
The half life period of a first order reaction is

Proportional to the initial concentration of reactants
Half the specific rate constant
Dependent on initial concentration of the reactants
Always the same irrespective of the reaction

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Chemical Reaction Engineering
For a heterogeneous catalytic reaction

Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction
The catalyst does not form an intermediate complex with the reactant
A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important
The surface of the catalyst does not play an important role during reaction

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Chemical Reaction Engineering
In an ideal P.F.R. at steady state conditions

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

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Chemical Reaction Engineering
The reactions of high molecularity are rare, because

Of requirement of very large concentration for such reactions
Of low probability of many body collisions
Of very large activation energy of many bodies
Many body collisions are not favoured energetically

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