Chemistry-Order of Reaction
NEET Chemistry Order of Reaction MCQ Question
Type: MCQ-diagram based-Medium-Class 12
Consider a graph where ln[R] is plotted against time (t) for a first-order reaction. What does the slope of this graph represent?
A
Negative rate constant (-k)
B
Positive rate constant (k)
C
Initial concentration [R]₀
D
Half-life of the reaction
Correct Answer
Option A
Detailed Explanation
For a first-order reaction, the graph of ln[R] versus time is a straight line with a slope equal to the negative of the rate constant (-k), as per the equation ln[R] = ln[R]₀ - kt.
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