Statement I : The degree of decomposition of PCl5 is more at low pressures.Statement II : In a reversible reaction, on increasing the pressure the equilibrium shifts in the direction in which decrease in volume takes place.

According to Le-chateliar principle, when the total pressure is decreased, the equilibrium shifts towards greater number of moles.Conversely when total pressure is incrased, the equilibrium shift toward less number of mole and so accompained by a decrease in volume.