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Helium gas is commonly used to move a sample through the gas chromatography column; in that case, helium is the _________.

1) a stationary phase
2) b detector
3) c mobile phase
4) d column

Answer :

Final answer:

In gas chromatography, helium is commonly used as the mobile phase, which transports the sample through the column while remaining inert and not interacting with the sample molecules. therefore the correct option is 3) c mobile phase

Explanation:

Helium gas is commonly used in gas chromatography as the mobile phase, which is the phase that moves through the column and transports the sample. The mobile phase is comprised of an inert gas like helium, hydrogen, or nitrogen, which does not interact with the molecules of the sample but elutes them based on their interactions with the stationary phase. On the other hand, the stationary phase can be either a solid or a liquid coated onto solid particles or the walls of the capillary column, with which the analyte compounds equilibrate.

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