NEET Chemistry Rate of Reaction MCQ Question
Which of the following statements about the half-life of reactions is correct?
The half-life of a first order reaction is constant and independent of initial concentration.
The half-life of a zero order reaction is constant regardless of the initial concentration.
The time to reach 99.9% completion of a first order reaction is equal to the half-life.
The half-life for a zero order reaction decreases as the concentration of the reactant increases.
Correct Answer
Detailed Explanation
For a first order reaction, the half-life is indeed constant and independent of the initial concentration, as stated in the NCERT context. Zero order reactions have a half-life that is directly proportional to the initial concentration, which makes option B incorrect.
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