Question : In a reaction type of A + B → C + D, one could ensure to be a first-order reaction by:
Option 1: increasing the temperature
Option 2: increasing the concentration of a product
Option 3: increasing the concentration of a reactant
Option 4: adding a catalyst
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Correct Answer: increasing the concentration of a reactant
Solution : The correct option is increasing the concentration of a reactant .
The first-order reaction depends on reactant concentration. Both are directly proportional to each other. Typically, this is achieved by having a large excess of one reactant, making its concentration essentially constant throughout the reaction.
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