The degree of dissociation of an electrolyte does not depend on

From the given plot between $\mathrm{Z}$ and  $\mathrm{p}$ for a real gas, the correct relation is:

For ideal binary solution,

${\mathrm{P}}_{\mathrm{T}}={\mathrm{X}}_{\mathrm{A}} {\mathrm{P}}_{\mathrm{A}}° + {\mathrm{X}}_{\mathrm{B}} {\mathrm{P}}_{\mathrm{B}}°$

This equation reflects