(a) 5.0

(b) 2.0

(c) 0.5

(d) 2

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- For a first order reaction, $ k = \frac{1}{t} log_e\frac{C_0}{C} $

$\therefore k_f = \frac{1}{t} log_e e^{-2.1 \times 10^{-3} t} = \frac{-2.1 \times 10^{-3} t}{t} = -2.1 \times 10^{-3} $

$\therefore k_r = \frac{1}{t} log_e e^{-4.2 \times 10^{-4} t} = -4.2 \times 10^{-4} $

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