Which among the following is an example of sorption?

Which among the following is an example of sorption?
  1. Oxygen gas is passed over finely divide nickel
  2. Charcoal is added to methylene blue solution
  3. Chalk is dipped in ink
  4. Hydrogen gas is passed over platinum

Solution

Colour pigment remains on the surface whereas solvent goes inside the bulk.

Asked in: MHT CET 2022 (06 Aug Shift 2)

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