Dehydration of formic acid gives `"………….."`.

Answer

To solve the question "Dehydration of formic acid gives __________," we need to understand the process of dehydration and the chemical structure of formic acid.

### Step-by-Step Solution:

1. **Identify the Chemical Structure of Formic Acid**:
- Formic acid has the chemical formula HCOOH. It consists of a carbon atom (C) bonded to a hydroxyl group (OH) and a hydrogen atom (H), along with a carbonyl group (C=O).

2. **Understand Dehydration**:
- Dehydration refers to the removal of water (H2O) from a substance. In this case, we are removing water from formic acid.

3. **Reaction Conditions**:
- To dehydrate formic acid, we typically use concentrated sulfuric acid (H2SO4) and apply heat. This facilitates the removal of water.

4. **Perform the Dehydration Reaction**:
- When formic acid is heated in the presence of concentrated sulfuric acid, a water molecule (H2O) is removed from the formic acid molecule. The reaction can be represented as:
\[ \text{HCOOH} \xrightarrow{\text{H}_2\text{SO}_4, \text{heat}} \text{CO} + \text{H}_2\text{O} \]
- The product of this reaction is carbon monoxide (CO) and water (H2O).

5. **Final Answer**:
- Therefore, the dehydration of formic acid gives **carbon monoxide (CO)**.