Sodium salt of formic acid on strong heating followed by acidification gives-

Options

A. Formic acid
B. Oxalic acid
C. Formaldehyde
D. Acetaldehyde

Answer

To solve the question regarding what the sodium salt of formic acid produces upon strong heating followed by acidification, we can break down the process into clear steps:

### Step 1: Identify the Sodium Salt of Formic Acid
The sodium salt of formic acid is sodium formate, which can be represented as:
\[ \text{HCOONa} \]

### Step 2: Understand the Heating Process
When sodium formate is subjected to strong heating (around 440 degrees Celsius), it undergoes a decomposition reaction. This process breaks down the sodium formate into simpler compounds.

### Step 3: Decomposition Reaction
The decomposition of sodium formate can be represented as:
\[ \text{HCOONa} \rightarrow \text{CO}_2 + \text{Na}_2\text{CO}_3 + \text{H}_2 \]
However, in the context of this question, the primary focus is on the formation of oxalic acid upon acidification.

### Step 4: Acidification
After the decomposition, the product is treated with an acid (usually a strong acid like hydrochloric acid). This step is crucial as it converts the intermediate products into the final product.

### Step 5: Final Product
Upon acidification, the products of the decomposition can lead to the formation of oxalic acid:
\[ \text{CO}_2 + \text{H}_2\text{O} \rightarrow \text{C}_2\text{H}_2\text{O}_4 \text{ (Oxalic Acid)} \]

### Conclusion
Thus, the sodium salt of formic acid, when strongly heated and then acidified, yields oxalic acid.

### Final Answer:
The final product is **Oxalic Acid (C₂H₂O₄)**.

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