What is the slope of the straight line for the graph drawn between $\ln k$ and $\frac{1}{T}$,where $k$ is the rate constant of a reaction at temperature $T$?
- A$\frac{-E_a}{2.303 R}$
- B$\frac{-E_a}{R}$
- C$\frac{E_a}{R}$
- D$\frac{R}{E_a}$
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