Which one of the following is correct regarding physisorption?

Predict which of the following gases show least adsorption on a definite amount of charcoal? ${\mathrm{T}}_{\mathrm{c}}$ (Critical temperature) of gases in $\mathrm{K}$ scale is as

${\mathrm{CO}}_2\left({\mathrm{T}}_{\mathrm{c}}-304\mathrm{K}\right)$
${\mathrm{NH}}_3\left({\mathrm{T}}_{\mathrm{c}}-406\mathrm{K}\right)$
${\mathrm{SO}}_2\left({\mathrm{T}}_{\mathrm{c}}-430\mathrm{K}\right)$
$\mathrm{HCl}\left({\mathrm{T}}_{\mathrm{c}}-324\mathrm{K}\right)$

Which among the following sols are hydrophobic sols?

(i) Protein
(ii) Gold
(iii) Gum
(iv) $\mathrm{Fe}(\mathrm{OH}{)}_3$