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Question:

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is:

first

more than zero but less than first

second

zero

Solution:

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is 1. The half-life period t1/2 of the first-order reaction is independent of the initial concentration of the reactant. t1/2 = 0.693/k