Question

Which of the following is used as adsorbent in adsorption chromatography?

• A. Silica Gel
• B. Alumina
• C. Benzene
• D. Both A and B

Answer 1

The Correct Option is D

Adsorption chromatography is a technique that utilizes an adsorbent to separate mixtures of compounds. The adsorbent typically acts like a solid phase that selectively adsorbs the components from the mobile liquid phase, allowing for the separation of the compounds based on their differential affinities towards the adsorbent.

Let's analyze the options provided:

1. Silica Gel: Silica gel is a commonly used adsorbent in adsorption chromatography due to its high surface area and capacity to interact with a variety of molecules through hydrogen bonding and van der Waals forces. It is particularly effective in separating non-polar to moderately polar compounds.
2. Alumina: Alumina is another widely used adsorbent similar to silica gel. It is highly porous and has a large surface area, making it useful in the separation of polar compounds. Alumina can be used in both normal-phase and reverse-phase chromatography.
3. Benzene: Benzene is not used as an adsorbent in chromatography. Instead, it is an organic solvent that could be used as part of the mobile phase in certain types of chromatography, though not in adsorption chromatography.
4. Both A and B: As described above, both silica gel and alumina are quintessential adsorbents used in adsorption chromatography for separating various compounds based on their interaction with these adsorbent mediums.

Based on this explanation, the correct answer is BOTH A and B, as both silica gel and alumina function effectively as adsorbents in adsorption chromatography.