Question

Five coloured sweets P, Q, R, S and T were analysed using paper chromatography. The chromatogram obtained is shown below. How many different coloured dyes were used to colour the five sweets?

Answer 1

In a chromatogram, all spots on the same level represent the same dye and the number of spots at different level represents the number of type dyes used. Since there are four spots at a different level so four different coloured dyes were used to colour the five sweets.