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  • 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 Fig. 2.3.

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 Fig. 2.3. The filter paper was removed when the water moved near the top of the filter paper.


(i) What would you expect to see, if the ink contains three different coloured components?
(ii) Name the technique used by the child.
(iii) Suggest one more application of this technique.

Answers (1)

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Solution:
Chromatography is a method, which is used to separate components of any mixture.
In this process different component travels with different speed when dissolved in solution.
Due to different speed, all the components get separated from each other
(i) The components of the ink will travel with water with different speeds and we would see three bands on the filter paper at different levels.
(ii) Chromatography.
(iii) This technique is also used for separating pigments present in chlorophyll.

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