NEET Chemistry (general) MCQ Question
Which combinations of statements accurately describe the characteristics of first-order reactions?
The half-life is constant and independent of initial concentration; time for 99.9% completion is 10 times the half-life.
The rate constant depends on the initial concentration; the half-life increases with decreasing concentration.
The time required for completion of 99.9% of the reaction is equal to the half-life; the rate constant is variable.
The half-life is dependent on the temperature; the time for 99.9% completion is less than 10 times the half-life.
Correct Answer
Detailed Explanation
In a first-order reaction, the half-life is indeed constant and does not depend on the initial concentration, and the time for 99.9% completion is 10 times the half-life, as indicated in the NCERT context.
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