Question

Which gas is used as a carrier in Gas Chromatography?

• A. \( \text{Nitrogen} \)
• B. \( \text{Oxygen} \)
• C. \( \text{Carbon Dioxide} \)
• D. \( \text{Sulfur Dioxide} \)

Hint:

Carrier gases in GC must be inert to prevent chemical interactions with the sample components.

Answer 1

The Correct Option is A

Nitrogen (N\(_2\)) is commonly used as a carrier gas in Gas Chromatography (GC) due to its inert nature and optimal flow characteristics. Helium is also widely used because of its low viscosity and high diffusivity, ensuring efficient separation. Reactive gases like oxygen or sulfur dioxide are unsuitable for GC applications.