The mechanism for the reaction is given below:
$2P + Q \to S + T$
$P + Q \to R + S$ (slow)
$P + R \to T$ (fast)
The rate law expression for the reaction is:

  • A
    $r = k[P]^2[Q]$
  • B
    $r = k[P][Q]$
  • C
    $r = k[P][R]$
  • D
    $r = k[P]^2$

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