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Question

is based on difference in the solubility of different components of a mixture with the solvent.
  1. Crystallization
  2. Chromatography
  3. Filtration


Solution

The correct option is B Chromatography
Chromatography is basically a technique where the components of a mixture are separated on the adsorbent at different positions due to their different solubilities in the solvent. 

The most soluble component stays the longer with the solvent and travels the maximum distance with the solvent. 
On the other hand, the least soluble travels the shortest distance. 

In the given figure - 1 = Lid, 2 = Paper , 3 = Solvent front, 4 = Solvent
The yellow colour is most soluble and hence travels the farthest.
The red colour is least soluble and hence travels the least distance.

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