Assertion : `HCOOH` formic acid react with `H_(2)SO_(4)` to form `CO`.
Reason : `H_(2)SO_(4)` is mild (moderate) oxidizing agent.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both asertion and reason are false.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states that formic acid (HCOOH) reacts with sulfuric acid (H₂SO₄) to form carbon monoxide (CO).

**Reaction:**
When formic acid is heated with concentrated sulfuric acid, it undergoes dehydration to produce carbon monoxide and water:
\[ \text{HCOOH} + \text{H}_2\text{SO}_4 \rightarrow \text{CO} + \text{H}_2\text{O} \]

Thus, the assertion is **true**.

### Step 2: Analyze the Reason
The reason states that H₂SO₄ is a mild oxidizing agent.

**Properties of H₂SO₄:**
Concentrated sulfuric acid can act as a dehydrating agent and can also act as an oxidizing agent under certain conditions. However, in the case of the reaction with formic acid, H₂SO₄ primarily acts as a dehydrating agent, removing water from the reaction mixture rather than oxidizing formic acid.

Thus, while it is true that H₂SO₄ can be a mild oxidizing agent, in this specific reaction, it is not acting as such. Therefore, the reason is **true**, but it does not correctly explain the assertion.

### Conclusion
- The assertion is true.
- The reason is true, but it is not the correct explanation for the assertion.

### Final Answer
Both assertion and reason are true, but the reason is not a correct explanation of the assertion.