The reaction $2A \rightarrow \text{Product}$ follows first-order kinetics. If the initial concentration $[A]_0 = 0.2 \ mol \ L^{-1}$ and the half-life period $t_{1/2} = 20 \ min$,calculate the rate constant $k$.
- A$0.03465 \ min^{-1}$
- B$0.0693 \ min^{-1}$
- C$0.0173 \ min^{-1}$
- DNone of these
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