NEET Chemistry Order of Reaction MCQ Question
Consider a plot where ln[R] is plotted against time t for a first-order reaction. Which of the following correctly describes the slope of the line in this plot?

The slope is negative and equals -k.
The slope is positive and equals k.
The slope is zero, indicating a constant rate.
The slope is negative and equals ln[R]0.
Correct Answer
Detailed Explanation
In a first-order reaction, plotting ln[R] against time yields a straight line with a negative slope equal to -k, as derived from the equation ln[R] = ln[R]0 - kt.
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