Acidic oxide are oxide that react with water to form an acid.......and.....for example...... . Carbon dioxide, which reacts with water forming carbonic acid.....so option B is correct......

**Answer:**

**Carbon Dioxide as an Acidic Oxide:**

Carbon dioxide (CO2) is an example of an acidic oxide. An acidic oxide is a type of oxide that reacts with water to form an acid. When carbon dioxide dissolves in water, it forms carbonic acid (H2CO3) through the following reaction:

CO2 + H2O → H2CO3

The presence of carbonic acid in water lowers the pH value, making it more acidic. This is why carbon dioxide is considered an acidic oxide.

**Explanation:**

To understand why carbon dioxide is an acidic oxide, we need to understand the concept of oxides and their reactions with water.

**1. Oxides:**
Oxides are compounds that contain oxygen combined with another element. They can be classified into different types based on their chemical properties. The three main types of oxides are acidic oxides, basic oxides, and amphoteric oxides.

**2. Acidic Oxides:**
Acidic oxides are oxides that react with water to form an acid. They typically contain non-metals and have a higher electronegativity, which allows them to attract electrons and form acidic solutions. Examples of acidic oxides include carbon dioxide (CO2), sulfur dioxide (SO2), and nitrogen dioxide (NO2).

**3. Reaction with Water:**
When an acidic oxide reacts with water, it undergoes a chemical reaction called hydrolysis. In this reaction, the oxide reacts with water to form an acid. The general equation for the hydrolysis of an acidic oxide is:

Oxide + Water → Acid

**4. Carbon Dioxide as an Acidic Oxide:**
Carbon dioxide (CO2) is a non-metal oxide that dissolves in water to form carbonic acid (H2CO3). This reaction can be represented as:

CO2 + H2O → H2CO3

The formation of carbonic acid lowers the pH of the solution, making it acidic. Carbonic acid is a weak acid that is responsible for the fizz in carbonated beverages. Therefore, carbon dioxide is considered an acidic oxide.

In conclusion, carbon dioxide is an example of an acidic oxide because it reacts with water to form carbonic acid, which lowers the pH of the solution and makes it acidic.