Arrange the gases $H_2, CH_4, CO_2,$ and $NH_3$ in the order of their volume adsorbed on $1 \ g$ of charcoal at $288 \ K$.

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

In the Freundlich adsorption isotherm,the value of $x/m$ does not increase rapidly with an increase in the value of $p$,because .....

How many layers are adsorbed in chemical adsorption (chemisorption)?

The correct statement$(s)$ pertaining to the adsorption of a gas on a solid surface is (are):
$(A)$ Adsorption is always exothermic.
$(B)$ Physisorption may transform into chemisorption at high temperature.
$(C)$ Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature.
$(D)$ Chemisorption is more exothermic than physisorption,however it is very slow due to higher energy of activation.

The charge of $As_2S_3$ sol is due to the adsorption of