What is oxidation - reduction reaction or redox reaction ? Give one example.

Options

A. An oxidising agent accepts a proton
B. A reducing agent donates a proton
C. A reducing agent become oxidised as it accepts an electron
D. Energy is transferred from a reducing agent to an oxidising agent

Answer

**Step-by-Step Solution:**

1. **Definition of Oxidation-Reduction Reaction:**
- An oxidation-reduction reaction, commonly known as a redox reaction, is a chemical process in which there is a transfer of electrons between two substances. This process involves two key components: oxidation and reduction.

2. **Understanding Oxidation and Reduction:**
- **Oxidation** refers to the process where a substance loses electrons or hydrogen. It can also be defined as the increase in oxidation state.
- **Reduction** is the opposite process, where a substance gains electrons or hydrogen, resulting in a decrease in oxidation state.

3. **Identifying Oxidizing and Reducing Agents:**
- An **oxidizing agent** is a substance that causes oxidation by accepting electrons from another substance. It itself gets reduced in the process.
- A **reducing agent** is a substance that causes reduction by donating electrons to another substance. It itself gets oxidized in the process.

4. **Example of a Redox Reaction:**
- A classic example of a redox reaction is the reaction between hydrogen and oxygen to form water:
\[ 2H_2 + O_2 \rightarrow 2H_2O \]
- In this reaction, hydrogen (H₂) is oxidized (loses electrons) and oxygen (O₂) is reduced (gains electrons).