$0.50\mathrm{L}$ of a dye solution of $80\mathrm{mg}{\mathrm{L}}^{-1}$ is stirred with $2.0\mathrm{g}$ of adsorbent. The equilibrium concentration is $32\mathrm{mg}{\mathrm{L}}^{-1}$. Assume $x/m=kC$ (Freundlich, $1/n=1$). Which statements are correct?

1. A$x/m=12\mathrm{mg}{\mathrm{g}}^{-1}$
2. B$60\%$ of the dye is removed
3. C$k=0.150\mathrm{L}{\mathrm{g}}^{-1}$
4. DWith $4.0\mathrm{g}$ of adsorbent in the same volume and initial concentration, the equilibrium concentration would be $20\mathrm{mg}{\mathrm{L}}^{-1}$