For an isolated set of sequential consecutive first-order reactions defined as , which of the follow — Chemical Kinetics Chemistry Question

💡 Solution & Explanation

A is correct ($[A] = [A]_0 e^{-k_1t}$). B is correct (B builds up initially because $[A]$ is high, but as $[A]$ depletes and $[B]$ grows, the consumption $k_2[B]$ overtakes formation $k_1[A]$, causing a peak and fall). C is correct (mass conservation demands C eventually holds all mass). D is false: at $t_{max}$, $\frac{d[B]}{dt} = 0$, meaning the formation rate of B is mathematically $0$, whereas the formation rate of C is $k_2[B]_{max}$, which is positive.