Correct option is (A)
From Henry's law,
\(p_{gas} = k_H \times X_{gas}\)
\(\because X_{H_2O} + X_{gas} = 1\)
\(\therefore p_{gas} = k_H \times (1 - X_{H_2O})\)
\(\Rightarrow p = k_H - k_H \times X_{H_2O}\)
\(p = (-k_H) \times X_{H_2O} + k_H\)
From \(Y = mX + C\)
slope is \(-k_H\) and intercept is \(k_H\)
The intercepts are in the following order for w, x, y and z
\(w<x<y<z\)
The most appropriate plot is given by option A.
