When dry calcium formate is heated, it gives

Options

A. `CaHCO_(3)`
B. `H_(2)`
C. `CH_(2)O`
D. `CaCO_(3)`

Answer

To solve the question "When dry calcium formate is heated, it gives," we need to analyze the thermal decomposition of calcium formate. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Chemical Formula
Calcium formate has the chemical formula \( \text{Ca(HCOO)}_2 \). This means it consists of one calcium ion (Ca²⁺) and two formate ions (HCOO⁻).

### Step 2: Understand the Heating Process
When calcium formate is heated, it undergoes a process known as dry distillation. This process involves the breakdown of the compound into simpler substances upon heating.

### Step 3: Write the Reaction
The thermal decomposition of calcium formate can be represented by the following reaction:
\[ \text{Ca(HCOO)}_2 \xrightarrow{\text{heat}} \text{CH}_2\text{O} + \text{CaCO}_3 \]
This indicates that upon heating, calcium formate decomposes to produce formaldehyde (CH₂O) and calcium carbonate (CaCO₃).

### Step 4: Determine the Products
From the reaction, we can see that the products of heating calcium formate are:
1. Formaldehyde (CH₂O)
2. Calcium carbonate (CaCO₃)

### Conclusion
Thus, when dry calcium formate is heated, it yields formaldehyde and calcium carbonate. Therefore, the correct answer to the question is that it gives formaldehyde and calcium carbonate.

### Final Answer
The products are:
- Formaldehyde (CH₂O)
- Calcium carbonate (CaCO₃)