Which of the following gas is adsorbed most by activated charocal?

Options

A. `CO_2`
B. `N_2`
C. `CH_4`
D. Ar

Answer

To determine which gas is adsorbed most by activated charcoal, we can follow these steps:

### Step 1: Understand the Concept of Adsorption
Adsorption is the process by which atoms, ions, or molecules from a gas, liquid, or dissolved solid adhere to a surface. Activated charcoal has a high surface area and is commonly used for adsorbing various substances.

### Step 2: Identify the Properties of Gases
Different gases have different properties, including their ability to be liquefied. Gases that are easily liquefiable tend to be adsorbed more effectively by activated charcoal. This is due to their higher polarizability and stronger interactions with the surface of the charcoal.

### Step 3: Analyze the Given Gases
Assuming we have a list of gases to consider (for example: CO2, O2, N2, and CH4), we need to identify which of these gases is easily liquefiable.

- **CO2 (Carbon Dioxide)**: This gas is easily liquefiable under pressure and can be adsorbed effectively.
- **O2 (Oxygen)**: This gas is not easily liquefiable under normal conditions.
- **N2 (Nitrogen)**: Similar to oxygen, nitrogen is also not easily liquefiable.
- **CH4 (Methane)**: This gas is less easily liquefiable compared to CO2.

### Step 4: Conclude the Most Adsorbed Gas
Based on the analysis, CO2 is the most easily liquefiable gas among the options provided. Therefore, it is adsorbed most by activated charcoal.

### Final Answer
The gas that is adsorbed most by activated charcoal is **CO2 (Carbon Dioxide)**.

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