Question

7 a bottle of purple ink contains a mixture of red and blue dyes. which method is used to separate the dyes? a boiling b evaporation c distillation d paper chromatography queensway secondary school science department, 2026

Explanation:

To separate the red and blue dyes in purple ink, we analyze each method:

• Boiling (A) is for heating a liquid, not separating dyes.
• Evaporation (B) is for removing a solvent, not separating components of a mixture like dyes.
• Distillation (C) separates substances based on boiling points, not suitable for dye mixtures.
• Paper chromatography (D) separates components of a mixture (like dyes in ink) based on their different solubilities and rates of movement on paper. This is the correct method for separating the dyes.

Answer:

D. Paper chromatography