Which statement about chromatography is correct?
A.
It is not possible for two different substances to have the same \(R_{\mathrm{f}}\) value.
B.
It is only possible to use chromatography on substances which have a colour.
C.
It is possible to use chromatography on colourless substances using a locating agent.
D.
The \(R_{\mathrm{f}}\) value of a substance \(=\frac{\text { the distance travelled by the solvent }}{\text { the distance travelled by the substance }}\)
Exam No：0620_s24_qp_21 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:
Download APP for more features
1. Tons of answers.
2. Smarter Al tools enhance your learning journey.
IOS
Download
Download
Android
Download
Download
Google Play
Download
Download