Oxidation is a process that involves the following

Options

A. removal of hydrogen
B. addition of hydrogen
C. removal of oxygen
D. formation of monoxide

Answer

**Step-by-Step Text Solution:**

1. **Understanding Oxidation**: Oxidation is a chemical process that involves a change in the oxidation state of a substance. It can be defined as the addition of oxygen or the removal of hydrogen from a substance.

2. **Key Characteristics of Oxidation**:
- **Removal of Hydrogen**: When a substance loses hydrogen atoms, it undergoes oxidation.
- **Addition of Oxygen**: When a substance gains oxygen atoms, it also undergoes oxidation.
- **Increase in Oxidation Number**: In terms of oxidation numbers, if the oxidation state of an element increases, it indicates that oxidation has occurred.

3. **Example of Oxidation**:
- Consider the reaction of hydrogen sulfide (H₂S) with oxygen (O₂):
\[ 2 H_2S + O_2 \rightarrow 2 S + 2 H_2O \]
- In this reaction, hydrogen sulfide is oxidized to sulfur. The oxidation state of sulfur changes from -2 in H₂S to 0 in elemental sulfur (S), indicating an increase in oxidation number.

4. **Analyzing the Options**:
- **Option 1**: Removal of hydrogen - This is a characteristic of oxidation.
- **Option 2**: Addition of hydrogen - This is not oxidation; it is reduction.
- **Option 3**: Removal of oxygen - This is not a characteristic of oxidation.
- **Option 4**: Formation of monoxide - This does not directly relate to the definition of oxidation.

5. **Conclusion**: Based on the definitions and examples provided, the correct answer to the question is that oxidation involves the removal of hydrogen.