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
Exam No：0620_w24_qp_11 Year：2024 Question No：39
Answer:
C
Knowledge points:
12.3.1. Describe how paper chromatography is used to separate mixtures of soluble coloured substances, using a suitable solvent
12.3.2.1. unknown substances by comparison with known substances
12.3.2.2. pure and impure substances
12.3.3. Describe how paper chromatography is used to separate mixtures of soluble colourless substances, using a suitable solvent and a locating agent
12.3.4. State and use the equation
Solution:
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