Which of the following is false regarding adsorption?

Which of the following assertions about the extent of physisorption is correct?

When is the term 'sorption' used?

According to the Freundlich adsorption isotherm,which of the following is correct?

$CO_{2}$ gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal,the mass of $CO_{2}$ adsorbed becomes $64$ times when the pressure of $CO_{2}$ is doubled. The value of $n$ in the Freundlich isotherm equation is $......\,\times 10^{-2}$. (Round off to the Nearest Integer)

The colloidal sol of $SnCl_4$ prefers the adsorption of which ion in the presence of excess $HCl$?