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At constant temperature, the equilibrium constant $(K_p)$ for the decomposition reaction ${N_2}{O_4}$ $\rightleftharpoons$ $2N{O_2}$ is expressed by ${K_P} = \frac{{(4{x^2}P)}}{{(1 - {x^2})}}$, where $P = $ pressure, $x = $ extent of decomposition. Which one of the following statements is true

• A
  $K_p$ increases with increase of $P$
• B
  $K_p$ increases with increase of $x$
• C
  $K_p$ increases with decrease of $x$
• ✓
  $K_p$ remains constant with change in $P$ and $x$