Sulphuric acid can not be used

Options

A. As a picking agent
B. In lead storage batteries
C. In white paints
D. In manufacture of dyes

Answer

To solve the question "Sulphuric acid cannot be used as", we will analyze each option provided and determine where sulfuric acid is not applicable.

### Step-by-Step Solution:

1. **Understanding the Question**: We need to identify the context in which sulfuric acid (H₂SO₄) cannot be used. The options provided are:
- A) Pickling agent
- B) In lead storage batteries
- C) In white paints
- D) In the manufacture of dyes

2. **Analyzing Option A - Pickling Agent**:
- A pickling agent is used to remove impurities from metals, such as rust or stains.
- Sulfuric acid is indeed a strong acid that can effectively remove these impurities.
- **Conclusion**: Sulfuric acid can be used as a pickling agent.

3. **Analyzing Option B - In Lead Storage Batteries**:
- In lead storage batteries, sulfuric acid is used as the electrolyte.
- It plays a crucial role in the chemical reactions that occur within the battery.
- **Conclusion**: Sulfuric acid is used in lead storage batteries.

4. **Analyzing Option C - In White Paints**:
- Sulfuric acid is not used in white paints because it can react with other components in the paint and produce sulfides, which would change the color of the paint from white.
- **Conclusion**: Sulfuric acid cannot be used in white paints.

5. **Analyzing Option D - In the Manufacture of Dyes**:
- Sulfuric acid can be used in the manufacture of dyes as it acts as a strong oxidizing agent.
- It is also utilized in various chemical processes involved in dye production.
- **Conclusion**: Sulfuric acid is used in the manufacture of dyes.

6. **Final Conclusion**:
- Based on the analysis, the option where sulfuric acid cannot be used is **C) In white paints**.

### Final Answer:
C) In white paints