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Rate constant from the slope of the log concentration against time graph

The same question, asked 2 times: 26 Apr 2025 S2*, 13 May 2026 S2. Every wording below, oldest first.

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  1. Question 1

    26 Apr 2025 S2

    94
    The slope of a graph log⁡[A]t\log\lbrack A\rbrack_{t} versus ' tt ' for first order reaction is −2.5×10−3 s−1- 2.5 \times10^{- 3}{\text{ }s}^{- 1}. Find rate constant of the reaction?

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  2. Question 2

    13 May 2026 S2

    29
    Calculate the rate constant of first order reaction if the slope of graph of log⁡[A]0/[A]t\log[A]_0/[A]_t versus time is 8.5×10−3 s−18.5 \times 10^{-3}\ \mathrm{s^{-1}}.

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