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Chromatography

Reena drops a...

Question

Reena drops a filter paper with different ink marking into a beaker containing water as shown in the figure. Which of the following can be observed and inferred after some time?

A

After some time the spots level arises

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B

All the ink spots move up at the same speed

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C

All the ink spots attains the same height

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D

All the ink spots move up at different speeds

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Solution

The correct options are
A After some time the spots level arises
D All the ink spots move up at different speeds
Chromatography is the technique used for the separation of those solutes that dissolve in the same solvent. In this technique, the difference in rate of movement of the solute particles is used to separate them.
The solution is made to move through an adsorbent solid. The component that is more soluble in the solvent, dissolves faster and moves faster in the medium.

In the figure, all the ink spots are of different colours. The solubility of each colour is different in the solvent. Thus, each colour moves up at a different speed and attains a different height.

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Q. Question 36
A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in the figure. The filter paper was removed when the water moved near the top of the filter paper.
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