What kind of difference is observed in the amount of adsorption with the increase in temperature?

Why is $Fe(OH)_3$ colloid positively charged when prepared by adding $FeCl_3$ to hot water?

The substance used to decolourise and purify oils is

In the adsorption of oxalic acid on activated charcoal,the activated charcoal is known as:

The mass of gas adsorbed,$x$,per unit mass of adsorbent,$m$,was measured at various pressures,$p$. $A$ graph between $\log(x/m)$ and $\log p$ gives a straight line with slope equal to $2$ and the intercept equal to $0.4771$. The value of $x/m$ at a pressure of $4 \text{ atm}$ is: (Given $\log 3 = 0.4771$)

The equation which represents the Freundlich adsorption isotherm is ($x = \text{amount of gas}$, $m = \text{mass of solid}$):