Read the following and answer any four questions
When a silvery grey powder of a solid (A) is mixed with a powder of solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with evolution of large amount of heat forming product (C) which settles down as liquid metal and the solid product (D) formed floats on the liquid (C). (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer any four questions
Amphoteric oxides are:

Options

A. Metal oxides which do not react with acids but reacts with bases.
B. Metal oxides which reacts with both acids as well as bases.
C. Metal oxides which reacts with acids but do not react with bases.
D. Metal oxides which shows no reaction with either acids or bases.

Explanation

To answer the question regarding amphoteric oxides, let's break it down step by step.

### Step-by-Step Solution:

1. **Understanding Oxides**:
- Oxides are compounds formed when an element combines with oxygen. They can be classified based on their reactivity with acids and bases.

2. **Definition of Amphoteric Oxides**:
- Amphoteric oxides are those oxides that can react with both acids and bases. This means they can exhibit both acidic and basic properties.

3. **Examples of Amphoteric Oxides**:
- A common example of an amphoteric oxide is Aluminum oxide (Al₂O₃). It can react with hydrochloric acid (HCl) as well as sodium hydroxide (NaOH).

4. **Reactions of Amphoteric Oxides**:
- When amphoteric oxides react with acids, they typically form salts and water.
- When they react with bases, they can also form complex ions or salts.

5. **Conclusion**:
- Therefore, amphoteric oxides are those that can react with both acids and bases, making them versatile in chemical reactions.