The mobile phase can bea.liquid and gas b.gas onlyc.liquid onlyd.solid onlyClear my choice

Understanding the Mobile Phase in Chromatography

In chromatography, the mobile phase is a crucial component that interacts with the stationary phase to facilitate the separation of components in a mixture.

1. Definition of Mobile Phase: The mobile phase is the solvent or gas that carries the sample through the stationary phase. It can be in various states, depending on the type of chromatography being performed.

2. Common Types of Mobile Phases:

   • In liquid chromatography, the mobile phase is typically a liquid solvent.
   • In gas chromatography, the mobile phase is a gas.
   • Some methods may combine both phases or involve different states for specific separations.

3. Options Analysis:

   • a. liquid and gas: This option is true as both can be used depending on the type of chromatography.
   • b. gas only: This is true for gas chromatography only, but not for all chromatography.
   • c. liquid only: This is true for liquid chromatography only, not comprehensive.
   • d. solid only: This is incorrect as the mobile phase cannot be solid.

Conclusion

The best choice is a. liquid and gas because it encompasses all types of chromatography where different mobile phases can be employed.