Detergent is:

Options

A. salt of strong acid and strong base
B. salt of weak acid and strong base
C. salt of strong acid and weak base
D. salt of weak acid and weak base

Answer

To determine what a detergent is, let's analyze the options provided and the properties of detergents.

### Step-by-Step Solution:

1. **Understanding Detergents**:
- Detergents are chemical compounds that help in the cleaning process by breaking down grease and dirt. They are often used in household cleaning products.

2. **Chemical Composition**:
- Detergents are typically made from the salts of acids and bases. The nature of these acids and bases can influence the properties of the detergent.

3. **Analyzing the Options**:
- **Option 1**: Salt of strong acid and strong base.
- **Option 2**: Salt of weak acid and strong base.
- **Option 3**: Salt of strong acid and weak base.
- **Option 4**: Salt of weak acid and weak base.

4. **Identifying the Correct Composition**:
- Detergents are primarily composed of salts formed from a strong base (like sodium hydroxide) and a weak acid (like sulfonic acid). This combination allows detergents to effectively interact with both water and oils.

5. **Example of a Detergent**:
- A common example of a detergent is Sodium Lauryl Sulfate (NaC12H25SO4).
- In this compound, sodium (Na) represents a strong base, while the lauryl sulfate part is derived from a weak acid (sulfonic acid).

6. **Conclusion**:
- Based on the analysis, the correct answer is that a detergent is a salt of a weak acid and a strong base.

### Final Answer:
The correct answer is **Option 2: Salt of weak acid and strong base**.