Silica gel and alumina are used as __________________?
Correct answer: B. Stationary phase
- A. Mobile phase
- B. Stationary phase
- C. Mixed phase
- D. Single phase
Explanation
Silica gel and alumina are polar solid adsorbents that remain fixed in column or thin-layer chromatography, so they act as the stationary phase. The solvent moving over them is the mobile phase. Students may choose a because silica gel and alumina come into contact with the solvent, but they do not move with it.
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About Properties of Liquids
Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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