The graph given below shows the relationship between the extent of adsorption $(x / m)$ and pressure at different temperatures. The correct order of temperatures for curves $i$, $ii$, and $iii$ is:

Explain the following terms related to Adsorption Chromatography:
$(a)$ Principle of Adsorption chromatography.
$(b)$ Adsorbent.
$(c)$ Mobile phase.
$(d)$ Adsorbate.

The number of statement/s which are the characteristics of physisorption is
$A.$ It is highly specific in nature
$B.$ Enthalpy of adsorption is high
$C.$ It decreases with increase in temperature
$D.$ It results into unimolecular layer
$E.$ No activation energy is needed

When $O_{2}$ is adsorbed on a metallic surface,electron transfer occurs from the metal to $O_{2}$. The $TRUE$ statement$(s)$ regarding this adsorption is(are)
$(A)$ $O_{2}$ is physisorbed
$(B)$ heat is released
$(C)$ occupancy of $\pi_{2p}^{*}$ of $O_{2}$ is increased
$(D)$ bond length of $O_{2}$ is increased

What is used to adsorb the poisonous gas obtained from the coal mine?

$10 \ g$ of a gas is adsorbed on $500 \ g$ of solid at $10 \ bar$. If the pressure is increased to $20 \ bar$, $14 \ g$ of the gas is adsorbed by the same solid at the same temperature. What is the slope of Freundlich adsorption isotherm?