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In the reaction, PCl5PCl3 + Cl2, the amounts of PCl5, PCl3 and Cl2 at equilibrium are 2 mole each and the total pressure is 3 atm. The equilibrium constant Kp is:

(a) 1.0 atm                                        (b) 2.0 atm

(c) 3.0 atm                                        (d) 6.0 atm