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At constant temperature, the equilibrium constant (Kp) for the decomposition reaction. N2O4 $⇌$2NO2 is expressed by,

Kp = (4x2P)/(1-x2)

where P= pressure, x = extent of decomposition. Which of the following statements is true?

(a)  Kp increases with increase of P

(b) Kp  increases with increase of  x

(c) Kp increase with decrease of x

(d) Kp remains constant with change in P of x