Substance $$\(X\)$$ and four known substances, P, Q, R and $$\(S\)$$, are analysed by chromatography. The chromatogram produced is shown. Which statement about $$\(X\)$$ is correct?
A.
It is a mixture of \(P, Q\) and \(S\).
B.
It contains \(P\) and \(S\) only.
C.
It contains \(\mathrm{P}, \mathrm{S}\) and another unknown substance.
D.
It is a mixture of \(Q, R\) and \(S\).
Exam No：0620_s24_qp_11 Year：2024 Question No：38
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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