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

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

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Chemical Reaction Engineering
A trickle bed reactor is the one, which

Has altogether three streams either entering or leaving
Processes three reactants with same flow rate
Processes three reactants at different flow rates
Employs all the three phases (i.e.. .solid, liquid and gas)

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