The correct match between item-I and Item-II is
A. Benzaldehyde P. Dynamic phase
B. Alumina Q. Adsor

Q: Why does benzaldehyde get adsorbed on alumina?

Benzaldehyde has polar functional groups that interact strongly with the polar surface of alumina through dipole-dipole interactions, causing it to stick or adsorb.

Q: What exactly is a dynamic phase?

The dynamic phase, also known as the mobile phase, is the solvent that flows through the chromatography column, carrying the mixture with it.

Q: Can acetonitrile act as an adsorbate?

While it can interact with the stationary phase, in this specific mixture, it has a much lower affinity for alumina compared to benzaldehyde, so it primarily acts as the flowing solvent.

Q: What is the difference between adsorbent and adsorbate?

The adsorbent is the solid surface (like alumina) where the process happens. The adsorbate is the substance (like benzaldehyde) that gets stuck to that surface.

Q: Is this process physical or chemical?

Adsorption chromatography primarily relies on physical adsorption (physisorption) driven by intermolecular forces like Van der Waals forces and hydrogen bonding.

Question

The correct match between item-I and Item-II is
$\begin{array}{ll} 	ext{A. Benzaldehyde} & 	ext{P. Dynamic phase} \ 	ext{B. Alumina} & 	ext{Q. Adsorbent} \ 	ext{C. Acetonitrile} & 	ext{R. Adsorbate} \end{array}$

Options:

(A) (A) $ightarrow$ (R); (B) $ightarrow$ (Q); (C) $ightarrow$ (P)

(B) (A) $ightarrow$ (P); (B) $ightarrow$ (R); (C) $ightarrow$ (Q)

(C) (A) $ightarrow$ (Q); (B) $ightarrow$ (P); (C) $ightarrow$ (R)

(D) (A) $ightarrow$ (Q); (B) $ightarrow$ (R); (C) $ightarrow$ (P)

Sigma Percentile · Accepted Answer

### Demystifying Adsorption Chromatography

Imagine you are trying to separate a complex mixture of chemicals. How do you do it? One of the most elegant and widely used techniques in chemistry is **Adsorption Chromatography**. This question tests your fundamental understanding of the components involved in this process. Let's break it down step by step.

### The Setup: The Stationary Phase

In adsorption chromatography, we start with a glass column packed with a solid material. This material is known as the **stationary phase** because, as the name suggests, it doesn't move. Common materials used for this purpose are **Alumina** ($	ext{Al}_2	ext{O}_3$) and Silica gel.

These materials have highly porous surfaces that are excellent at grabbing onto other molecules. Because they provide the surface for adsorption to occur, they act as the **Adsorbent**. Therefore, in our matching problem, **Alumina** perfectly pairs with **Adsorbent**.

### The Action: The Mobile Phase and Adsorption

Next, we introduce our sample mixture at the top of the column. In this scenario, our mixture contains **Benzaldehyde** and **Acetonitrile**.

As the mixture travels down the column, a competition begins. The molecules interact with the stationary alumina. Benzaldehyde has a strong affinity for the alumina surface. It "sticks" or gets adsorbed onto the solid particles. Because it is the substance being adsorbed, Benzaldehyde acts as the **Adsorbate**.

### The Flow: The Dynamic Phase

But what about Acetonitrile? Acetonitrile doesn't stick to the alumina as strongly. Instead, it acts as a solvent, carrying the mixture and flowing continuously through the column. Because it is constantly moving and driving the separation process, it is referred to as the mobile phase or the **Dynamic Phase**.

### Final Calculation

By understanding the roles of each chemical in the chromatography column, the matching becomes straightforward:
- **Benzaldehyde** is the substance that gets adsorbed, so it is the **Adsorbate** (A $ightarrow$ R).
- **Alumina** is the solid bed that provides the surface, so it is the **Adsorbent** (B $ightarrow$ Q).
- **Acetonitrile** is the flowing solvent, so it is the **Dynamic phase** (C $ightarrow$ P).

This perfectly aligns with option (a). It's a beautiful example of how physical properties like polarity and affinity can be harnessed to separate and analyze chemical mixtures!

Animated Solution for Chemistry - Surface Chemistry: The correct match between item-I and Item-II is $A. Benzaldehyde B. Alumina C. Acetonitrile P. Dynamic phase Q. Adsorbent R. Adsorbate$

Select Answer:

Visualized Solution

$Adsorption Chromatography$

$Stationary Phase$

$Adding the Mixture$

$The Adsorbate$

$The Dynamic Phase$

$Final Conclusion$

The Sigma Insight: Adsorption

Demystifying Adsorption Chromatography

The Setup

The Action

The Flow

Final Calculation

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