For the reaction $H_{2(g)} + CO_{2(g)} \rightleftharpoons CO_{(g)} + H_2O_{(g)}$. If the initial concentration of $[H_2] = [CO_2] = 1 \ M$ and $x \ mol/L$ of hydrogen is consumed at equilibrium,then the correct expression of $K_p$ is
- A$\frac{x^2}{(1 - x)^2}$
- B$\frac{(1 + x)^2}{(1 - x)^2}$
- C$\frac{x^2}{(2 + x)^2}$
- D$\frac{x^2}{1 - x^2}$
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