For a first order reaction,the graph between $\log \frac{a}{(a-x)}$ (on $y$-axis) and time (in $min$,on $x$-axis) gave a straight line passing through origin. The slope is $2 \times 10^{-3} \ min^{-1}$. What is the rate constant (in $min^{-1}$)?
- A$2 \times 10^{-3}$
- B$\frac{2 \times 10^{-3}}{2.303}$
- C$4.606 \times 10^{-3}$
- D$0.5 \times 10^{-5}$
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