Which of the following gases cannot be in the mobile phase of gas chromatography? Choose one answer. Helium Argon Carbon dioxide Nitrogen

Break Down the Problem

1. Identify what the mobile phase in gas chromatography is.
2. Determine which gases are commonly used as mobile phases.
3. Analyze the properties of each gas listed.

Relevant Concepts

Gas chromatography typically uses inert gases as the mobile phase. Common gases include helium, nitrogen, and sometimes hydrogen. The gas must not react with the sample or the stationary phase.

Analysis and Detail

1. Helium: An inert gas commonly used as a mobile phase.
2. Argon: Also an inert gas but less commonly used due to its higher molecular weight and cost.
3. Carbon Dioxide: While it has utility in some applications, it can react with certain samples and is generally not used as a mobile phase in traditional gas chromatography.
4. Nitrogen: A standard inert gas frequently used in gas chromatography.

Verify and Summarize

Given the analysis, carbon dioxide is more likely to react with samples during chromatography, making it less suitable as a mobile phase than the other options.

Final Answer

Carbon dioxide cannot be in the mobile phase of gas chromatography.