The following equilibria are given:
$N_2 + 3H_2 \rightleftharpoons 2NH_3 ; K_1$
$N_2 + O_2 \rightleftharpoons 2NO ; K_2$
$H_2 + \frac{1}{2}O_2 \rightleftharpoons H_2O ; K_3$
The equilibrium constant of the reaction $2NH_3 + \frac{5}{2}O_2 \rightleftharpoons 2NO + 3H_2O$ in terms of $K_1, K_2$ and $K_3$ is:

  • A
    $\frac{K_1 K_2}{K_3}$
  • B
    $\frac{K_1 K_3^2}{K_2}$
  • C
    $\frac{K_2 K_3^3}{K_1}$
  • D
    $K_1 K_2 K_3$

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