How many layers are adsorbed in chemical adsorption?

Options

A. One
B. Two
C. Many
D. Zero

Answer

To determine how many layers are adsorbed in chemical adsorption, we can follow these steps:

### Step 1: Understand Chemical Adsorption
Chemical adsorption, also known as chemisorption, involves a chemical reaction between the adsorbate (the substance being adsorbed) and the surface of the adsorbent (the material on which adsorption occurs). This interaction typically results in the formation of a chemical bond.

**Hint:** Recall that chemical adsorption involves a chemical reaction, which is different from physical adsorption.

### Step 2: Identify the Nature of Adsorption Layers
In chemical adsorption, the interaction is strong and often irreversible. This means that the adsorbate forms a stable bond with the surface of the adsorbent. Due to the nature of these strong interactions, only one layer of adsorbate is typically formed on the surface.

**Hint:** Think about the stability of the bonds formed during chemical adsorption compared to physical adsorption.

### Step 3: Conclude the Number of Layers
Since chemical adsorption results in the formation of a single layer due to the strong bonding and the nature of the interaction, we can conclude that only one layer is adsorbed in chemical adsorption.

**Hint:** Consider how the formation of a single layer affects the overall properties of the adsorbent.

### Final Answer
In chemical adsorption, only **one layer** is adsorbed.