Which is not the use of sulphuric acid ?

Options

A. Petroleum refining
B. Detergent industry
C. Manufacture of aqua regia
D. In storage batteries

Answer

To determine which option is not a use of sulfuric acid, we will analyze the given options one by one.

### Step 1: Identify the Uses of Sulfuric Acid
1. **Petroleum Refining**: Sulfuric acid is used in petroleum refining to wash impurities out of gasoline and other refinery products. This is a valid use of sulfuric acid.

2. **Detergent Industry**: Sulfuric acid is also used in the production of detergents. Many common household detergents are sulfonates or salts of benzene sulfonic acid, which are prepared using sulfuric acid. This is another valid use.

3. **Aqua Regia**: Aqua regia is a mixture of three parts concentrated hydrochloric acid (HCl) and one part concentrated nitric acid (HNO3). It does not contain sulfuric acid. Therefore, this is not a use of sulfuric acid.

4. **Storage Batteries**: Sulfuric acid is used as an electrolyte in lead storage batteries. This is a valid use of sulfuric acid.

### Step 2: Conclusion
After analyzing all the options, we conclude that the manufacture of aqua regia is not a use of sulfuric acid. Therefore, the answer is:

**Option C: Manufacture of Aqua Regia.**

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