Which among the following is an example of sorption?
- A$A$. Oxygen gas is passed over finely divided nickel
- B$B$. Charcoal is added to methylene blue solution
- C$C$. Chalk is dipped in ink
- D$D$. Hydrogen gas is passed over platinum
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$[R = 0.0821 \, L \, atm \, K^{-1} \, mol^{-1}]$
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