Question

which gas used as a mobile face in gas chromatography​

Answer 1

Answer:

Nitrogen, Helium and hydrogen gas

Answer 2

Answer:

The mobile phase used in GC is an inert gas, such as nitrogen, helium, or hydrogen. The mobile phase is usually referred to as a carrier gas; when a mixture of substances is injected at the column inlet, each component is carried toward the detector by the mobile carrier gas.