Answer:
Paper chromatography: It is a
type of partition chromatography. The process is similar to thin layer chromatography,
except that a strip of paper acts as the adsorbent. Paper chromatography is
based on a mechanism which is partly partition and partly adsorption. The paper
consists of cellulose fibre shaving molecules of water strongly adsorbed on
them.
This serves as the
stationary phase while a suitable organic solvent is used as a mobile
phase. A drop of the solution of a mixture to be separated is placed on a strip
of chromatographic paper and the solvent is allowed to travel along the strip.
When the eluting solvent moves upwards, it is termed ascending paper chromatography
and when the eluting solvent moves downwards, it is termed descending paper chromatography.
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