Question

For a first-order reaction $A \rightarrow B$ the plot of \log \left\\{[A]_{t} / 1 M \right\\} versus $t$ is linear with a

• A. positive slope and zero intercept
• B. positive slope and non zero intercept
• C. negative slope and zero intercept
• D. negative slope and non zero intercept

Answer 1

Answer: (D)

negative slope and non zero intercept

Answer 2

For a first-order reaction, the rate expression is \log \left\\{[A]_{t} M\right\\}-\log \left\\{[A]_{0} M\right\\}=-\\{k t / 2.303\\} Thus, the plot of \log \left\\{[A]_{t} / M \right\\} versus $t$ is linear with a negative slope $\left(-\frac{k}{2.303}\right)$ and non zero intercept.