Question

• Take a thin strip of filter paper.
• Draw a line on it using a pencil, approximately 3 cm above the lower edge.
• Put a small drop of ink (water soluble, that is, from a sketch pen or fountain pen) at the centre of the line. Let it dry.
• Lower the filter paper into a jar/glass/ beaker/test tube containing water so that the drop of ink on the paper is just above the water level, as shown and leave it undisturbed.
• Watch carefully, as the water rises up on the filter paper. Record your observations.
1. What do you observe on the filter paper as the water rises on it?
2. Do you obtain different colours on the filter paper strip?
3. What according to you, can be the reason for the rise of the coloured spot on the paper strip?
NCERT Class 9th Science Ch 2 Is Matter Around Us Pure

Answer 1

1. As the water rises, small different colluded dots appear one above the other till the top of the paper strip.
2. Yes.
3. It can be because the water rises up the paper strip due to capillary action and as it moves up, it carries different coloured dyes up with it which it leaves behind as it moves up, thus separating them.
The 3rd one is just an 'according to you' answer, if you understand, but I've forgotten the working of chromatography.
Plz mark as brainliest :D

Answer 2

1) I notice different layers of colours
2) Yes
3) Because ink is made of so many things