How can we obtain colour components from blue/black ink?

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By distillation

By evaporation

By sedimentation

By centrifugation

answer is B.

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Detailed Solution

concept - Through the process of evaporation, we can separate the dye from the ink.
Ink is a mixture of dye in water, so the volatile solvent (water) can be separated from its non-volatile solute (dye) in a container by evaporation.
The colour component (dye) can be separated from the ink using the following procedure:
●       Take a watch glass with some ink
●       Now take the beaker of water
●       Place the watch glass over the mouth of the beaker
●       Now start heating the beaker.
●       As the beaker heats up, so does the ink in the watch glass on the beaker.
●       Evaporation starts from the hourglass.
●       Continue heating until evaporation continues and stop heating when no further change is seen on the watch glass.
●       We see that the water in the ink evaporates
●       However, the dye remains as a residue on the watch glass.
Hence, the correct option is (2).

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