The force of attraction present in physical adsorption is ....

If $x$ is the mass of the gas adsorbed on mass $m$ of the adsorbent at pressure $p,$ Freundlich adsorption isotherm gives a straight line on plotting

Which among the following is an example of sorption?

$A$ charcoal cube having side length $10 \ cm$ is chopped lengthwise into $5$ equal pieces. Then the effective adsorption power

The number of incorrect statement/s from the following is/are:
$A.$ Water vapours are adsorbed by anhydrous calcium chloride.
$B.$ There is a decrease in surface energy during adsorption.
$C.$ As the adsorption proceeds,$\Delta H$ becomes more and more negative.
$D.$ Adsorption is accompanied by decrease in entropy of the system.

What is the role of adsorption in the froth floatation process used especially for the concentration of sulphide ores?