The rate constant of a first order reaction is $3 \times 10^{-6} \ s^{-1}$. If the initial concentration is $0.10 \ M$,the initial rate of reaction is:
- A$3 \times 10^{-5} \ M \ s^{-1}$
- B$3 \times 10^{-6} \ M \ s^{-1}$
- C$3 \times 10^{-8} \ M \ s^{-1}$
- D$3 \times 10^{-7} \ M \ s^{-1}$
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