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 what?", we can follow these steps:

### Step 1: Understand the Composition of Calcium Formate
Calcium formate is a chemical compound with the formula \( \text{Ca(HCOO)}_2 \). It consists of calcium ions (\( \text{Ca}^{2+} \)) and formate ions (\( \text{HCOO}^- \)).

### Step 2: Write the Reaction for Heating Calcium Formate
When calcium formate is heated, it undergoes a decomposition reaction. The thermal decomposition of calcium formate can be represented as follows:

\[ \text{Ca(HCOO)}_2 \xrightarrow{\text{heat}} \text{HCHO} + \text{CaCO}_3 \]

### Step 3: Identify the Products
From the reaction, we can see that the products formed when dry calcium formate is heated are:
1. **Formaldehyde (HCHO)** - This is an aldehyde and is a colorless gas with a pungent odor.
2. **Calcium Carbonate (CaCO3)** - This is a white solid that occurs naturally in rocks and is the main component of shells of marine organisms.

### Step 4: Conclusion
Thus, the final answer to the question is that when dry calcium formate is heated, it produces formaldehyde and calcium carbonate.

### Final Answer
When dry calcium formate is heated, it gives formaldehyde (HCHO) and calcium carbonate (CaCO3).

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