$A$ chemical reaction proceeds through the following steps:
Step-$I$: $2A \rightleftharpoons X$ (fast)
Step-$II$: $X + B \rightarrow Y$ (slow)
Step-$III$: $Y + B \rightarrow \text{Product}$ (fast)
The rate law for the overall reaction is:

  • A
    Rate $= K[A]^2$
  • B
    Rate $= K[B]^2$
  • C
    Rate $= K[A][B]$
  • D
    Rate $= K[A]^2[B]$

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