Gas Chromatography
Mediumchemistry
Gas chromatography separation depends mainly on differences in:
Select the correct option:
Solution
Incorrect! Answer:
Vapor pressure and interaction with stationary phase
- Principle: Separates volatile compounds in the gas phase.
- Mobile Phase: An inert carrier gas (e.g.,Helium).
- Stationary Phase: A high-boiling liquid or a solid absorbent coated on a column wall.
- Volatility: Compounds with higher vapor pressures (lower boiling points) spend more time in the gas phase and travel faster.
- Affinity: Separation also depends on the 'chemical like' interactions (VanderWaals, dipole-dipole) between the solute and the stationary phase.
- Separation: Together, these factors lead to different retention times for different molecules.
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About This Question
- Subject
- chemistry
- Chapter
- purification techniques
- Topic
- gas chromatography
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Vapor pressure and interaction with stationary phase
- Principle: Separates volatile compounds in the gas phase.
- Mobile Phase: An inert carrier gas (e.g.,Helium).
- Stationary Phase: A high-boiling liquid or a solid absorbent coated on a column wall.
- Volatility: Compounds with higher vapor pressures (lower boiling points) spend more time in the gas phase and travel faster.
- Affinity: Separation also depends on the 'chemical like' interactions (VanderWaals, dipole-dipole) between the solute and the stationary phase.
- Separation: Together, these factors lead to different retention times for different molecules.
This medium difficulty chemistry question is from the chapter purification techniques, covering the topic of gas chromatography. It appeared in the 2025 exam.
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