The dissociation of `PCI_5` decreases in presence of `CI_2` Why ?

Why does the dissociation of PCl_5 decrease in the presence of Cl_2 ?

The degree of dissociation of PCl_(5) decreases with increase in pressure.

Asseration : In the dissociation of PCI_(5) at constant pressure and temperature addition of helium at equilibrium increases the dissociation of PCI_(5) . Reason : Helium removes CI_(2) from the field of action.

The dissociation of HI independent of pressure, while dissociation of PCI_5 depends upon the pressure applied .

Phosphorous pentachloride dissociates as follows (in a closed reaction vessel): PCI_(5)(g)hArrPCI_(3)(g)+CI_(2)(g) If the total pressure at equilibrium on the reaction mixture is P and the degree of dissociation of PCI_(5) is x, the partial pressure of PCI_(3) will be

the degree of dissociation of PCI_(5) at a certain temperature and under one atmosphere pressure is 0.2. Calculate the pressure at which it is half dissociated at the same temperature.

The reaction of toluene with CI_(2) in presence of FeCI_(3) gives predominantly