$T_{50}$ of a first-order reaction is $10 \ min$. Starting with $10 \ mol \ L^{-1}$,the rate after $20 \ min$ is:
- A$0.0693 \ mol \ L^{-1} \ min^{-1}$
- B$0.0693 \times 2.5 \ mol \ L^{-1} \ min^{-1}$
- C$0.0693 \times 5 \ mol \ L^{-1} \ min^{-1}$
- D$0.0693 \times 10 \ mol \ L^{-1} \ min^{-1}$
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