Ncert Exercises & Solutions

During the hearing of a court case, the judge suspected that some changes in the documents had been
carried out. He asked the forensic department to check the ink used at two different places. Which
technique is most effective in providing the best results?

1.	Column chromatography	2.	Solvent extraction
3.	Distillation	4.	Thin layer chromatography

Hint: Layer of adsorbent is spread over a glass plate

Thin layer chromatography (TLC) is an another type of adsorption which involves separation of substances of a mixture over a thin layer of an adsorbent coated on a glass plate.

A thin layer of an adsorbent is spread over a glass plate and glass plate is placed in an eluant. As eluant rises, components of the mixture move up along with the eluant to different distances depending on their degree of adsorption and separation takes place.

Therefore, this TLC technique will give best results in identifying the different types of ink used at different places in the documents.

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