ideal gas


for real gas, curve is similar to B option
so initially Zreal<Zideal then becomes equal at some P, then at high P, Zreal>Zideal
so if on y axis we replaced Zideal by Zreal, then now
curve initially is above z=1(which is zreal)
then equal at sOME p, then lesser then Z=1(WHICH IS Z REAL)ahence ans must be A

@HarshithaVanam initially the y axis represents the variation in compressibility of real gas with pressure but later it represents the variation of compressibility factor of ideal gas with respect to pressure with the Z for real gas being fixed to 1