Chemical Reaction Engineering
Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants ; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is

Chemical Reaction Engineering
A catalyst loses its activity due to

Covering of the catalytic active sites by a foregin substance
Loss in surface area of the active component
All of these
Agglomeration of metal particles caused by thermal sintering of the solid surface

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