The reaction $A + B \xrightarrow{k}$ product is first order with respect to $A$ and zero order with respect to $B$. If $a_0$ and $a_t$ are the concentrations of $A$ at $t = 0$ and after time $t \, sec$ respectively,then select the correct relationship -
- A$a_t = a_0 e^{-kt}$
- B$a_t = a_0 - kt$
- C$a_t = a_0 + kt$
- D$a_t = a_0 e^{kt}$
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