Which of the following is // are amphotelic ?

Options

A. `BeO`
B. `Ag_2O`
C. `CO_2`
D. SnO_2`

Answer

To determine which of the given substances are amphoteric, we need to understand the definition of amphoteric substances. Amphoteric substances can act as both acids and bases. Let's analyze the options step by step.

### Step 1: Identify the substances
We need to identify the substances mentioned in the video transcript:
1. Beryllium oxide (BeO)
2. Silver oxide (Ag2O)
3. Tin oxide (SnO2)
4. Carbon dioxide (CO2)

### Step 2: Analyze Beryllium Oxide (BeO)
Beryllium oxide reacts with water to form beryllium hydroxide (Be(OH)2), which is amphoteric. Therefore, BeO can act as both an acid and a base.
- **Conclusion**: Beryllium oxide is amphoteric.

### Step 3: Analyze Silver Oxide (Ag2O)
Silver oxide is soluble in both acids and bases, indicating that it can react as an acid in the presence of a base and as a base in the presence of an acid.
- **Conclusion**: Silver oxide is amphoteric.

### Step 4: Analyze Tin Oxide (SnO2)
Tin oxide is also amphoteric due to the metalloid nature of tin. It can react with acids and bases, showing its ability to act as both.
- **Conclusion**: Tin oxide is amphoteric.

### Step 5: Analyze Carbon Dioxide (CO2)
Carbon dioxide reacts with water to form carbonic acid (H2CO3). It primarily exhibits acidic behavior and does not show basic properties.
- **Conclusion**: Carbon dioxide is not amphoteric; it is acidic.

### Final Conclusion
The amphoteric substances from the given options are:
- Beryllium oxide (BeO)
- Silver oxide (Ag2O)
- Tin oxide (SnO2)

### Summary of Results
- **Amphoteric Substances**: Beryllium oxide, Silver oxide, Tin oxide
- **Not Amphoteric**: Carbon dioxide

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