The adsorption of hydrogen by metals is called

Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.

If $x$ gram of gas is adsorbed by $m$ gram of adsorbent at pressure $P$,the plot of $\log \frac{x}{m}$ versus $\log P$ is linear. The slope of the plot is: ($n$ and $k$ are constants and $n > 1$ )

Which of the following statements is not correct?

Absorption and adsorption are respectively

Why are powdered substances more effective adsorbents than their crystalline forms?