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It is appropriate to use pseudo-first order rate law when all reactant concentrations are changing, making the reaction very difficult to study. In this case, we make one reactant concentration small and the others large so that the reaction rate is dependent on only one reactant.
You can use the pseudo especially when your rate law is dependent on multiple reactants. If the reaction is first order with respect to any of them it can be rewritten as pseudo-first order.
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