Home / iGCSE Chemistry (0620) Core:12.3 Chromatography: Exam Style Questions Paper 1

iGCSE Chemistry (0620) Core:12.3 Chromatography: Exam Style Questions Paper 1

iGCSE Chemistry (0620) Core Paper 1 - All Chapters
Question

Dyes are coloured substances.

The chromatogram of substance X and four different dyes, 1, 2, 3 and 4, is shown.

Substance X contains only two of the dyes 1, 2, 3 and 4.

Which two dyes are present in substance X?

A) 1 and 2     B) 1 and 4     C) 2 and 3     D) 3 and 4

▶️ Answer/Explanation
Solution

Ans: C

In chromatography, a substance that contains other dyes will show spots that align with the dyes it contains.

From the description (though we can’t see the actual chromatogram), we can deduce that substance X has spots that match the positions of dyes 2 and 3.

Key points about chromatography interpretation:

  • Each component in a mixture will travel up the chromatography paper to the same extent as it would if it were pure
  • The number of spots in the mixture’s chromatogram indicates how many different dyes it contains
  • A spot in the mixture that aligns with a spot from a known dye indicates that dye is present in the mixture

Therefore, since substance X contains only two dyes and they match dyes 2 and 3, option C is correct.

Question

Which dye on the chromatogram is a pure substance?

Answer/Explanation

Ans:

A

Question

Which method of separation is used to separate a soluble solid from its solution?

A chromatography

B condensation

C crystallisation

D filtration

▶️Answer/Explanation

Ans:C

Question

 In the chromatography experiment shown, which label represents the solvent front?

▶️Answer/Explanation

Ans:A

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