What is the difference between adsorbent and adsorbate?

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$Adsorbent$$Adsorbate$
The substance on the surface of which adsorption occurs is called an adsorbent.The substance which gets adsorbed on the surface of another substance is called an adsorbate.
$e.g.$ silica gel,activated charcoal,alumina.$e.g.$ gases like $O_2$,$H_2$ on charcoal,dyes,inorganic ions.

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$CH_4$ is adsorbed on $1 \ g$ charcoal at $0^{\circ} C$ following the Freundlich adsorption isotherm. $10.0 \ mL$ of $CH_4$ is adsorbed at $100 \ mm$ of $Hg$,whereas $15.0 \ mL$ is adsorbed at $200 \ mm$ of $Hg$. The volume of $CH_4$ adsorbed at $300 \ mm$ of $Hg$ is $10^x \ mL$. The value of $x$ is $....\times 10^{-2}$ (Nearest integer). [Use $\log_{10} 2=0.3010, \log_{10} 3=0.4771$]

Which of the following is not a characteristic of chemisorption?

Compare the enthalpy of chemical adsorption with physical adsorption.

Give the differences between physical adsorption and chemical adsorption.

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Which of the following statements about physical adsorption is not correct?

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