Substance $$\(Q\)$$ is tested using paper chromatography. The resulting chromatogram is shown. Which statement is correct?
A.
\(Q\) is a pure substance.
B.
The \(R_{\mathrm{f}}\) value of the lower spot is 0.25 .
C.
\(Q\) is a mixture of at least two different substances.
D.
\(Q\) is a compound of two elements.
Exam No：0620_m24_qp_22 Year：2024 Question No：40
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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