Which of the following is not a mineral acid?

Options

A. HCl
B. `H_2 SO_4`
C. `HCOOH`
D. `H_2 CO_3`

Answer

To determine which of the following is not a mineral acid, we need to first understand the definition of mineral acids.

### Step-by-Step Solution:

1. **Definition of Mineral Acids**:
- Mineral acids are inorganic acids that are typically derived from minerals. They are soluble in water and do not dissolve in organic solvents. Common examples include hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3).

2. **Identifying the Options**:
- Let's consider the common acids that might be presented as options:
- Hydrochloric acid (HCl)
- Sulfuric acid (H2SO4)
- Formic acid (HCOOH)
- Sulfurous acid (H2SO3)

3. **Analyzing Each Acid**:
- **HCl (Hydrochloric acid)**: This is a mineral acid as it is inorganic and soluble in water.
- **H2SO4 (Sulfuric acid)**: This is also a mineral acid, being inorganic and water-soluble.
- **HCOOH (Formic acid)**: This is an organic acid, derived from living organisms, and is not classified as a mineral acid.
- **H2SO3 (Sulfurous acid)**: This is a mineral acid as it is inorganic and soluble in water.

4. **Conclusion**:
- Among the listed options, formic acid (HCOOH) is not a mineral acid. Therefore, the answer to the question is **formic acid**.

### Final Answer:
Formic acid (HCOOH) is not a mineral acid.