Which gas is adsorbed easily at solid surface?

Options

A. `SO_(2)`
B. `H_(2)`
C. `O_(2)`
D. `N_(2)`

Answer

To determine which gas is adsorbed easily at a solid surface, we need to consider the properties of the gases listed in the options: sulfur dioxide (SO2), hydrogen (H2), oxygen (O2), and nitrogen (N2).

### Step 1: Understand Adsorption
Adsorption is the process where molecules from a gas or liquid adhere to a solid surface. The extent of adsorption depends on the intermolecular forces between the gas molecules and the solid surface.

### Step 2: Identify Easily Liquefiable Gases
Gases that can be easily liquefied tend to have stronger intermolecular forces. These gases are more likely to be adsorbed on solid surfaces. Common examples of easily liquefiable gases include ammonia (NH3), sulfur dioxide (SO2), methane (CH4), and hydrogen chloride (HCl).

### Step 3: Analyze the Options
- **Sulfur Dioxide (SO2)**: This gas is easily liquefiable and has significant intermolecular forces.
- **Hydrogen (H2)**: This is a permanent gas with weak intermolecular forces and is not easily liquefiable.
- **Oxygen (O2)**: Similar to hydrogen, oxygen is also a permanent gas with weak intermolecular forces.
- **Nitrogen (N2)**: Like hydrogen and oxygen, nitrogen is a permanent gas and is not easily liquefiable.

### Step 4: Conclusion
Among the given options, sulfur dioxide (SO2) is the only gas that is easily liquefiable and has stronger intermolecular forces. Therefore, it will be adsorbed more readily on a solid surface compared to hydrogen, oxygen, or nitrogen.

### Final Answer
**Sulfur Dioxide (SO2) is the gas that is adsorbed easily at a solid surface.**

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