`FeCr_(2)O_(4)+Na_(2)CO_(3)+O_(2) to Fe_(2)O_(3)darr+Na_(2)CrO_(4)`

Options

A. For disproportionation reaction.
B. For comproportionation reaction.
C. For either intermolecular redox reaction or displacement reaction
D. For either thermal combination redox reaction or thermal decomposition redox reaction.

Answer

To solve the question regarding the reaction \( \text{FeCr}_2\text{O}_4 + \text{Na}_2\text{CO}_3 + \text{O}_2 \rightarrow \text{Fe}_2\text{O}_3 + \text{Na}_2\text{CrO}_4 \), we will analyze the nature of the reaction step by step.

### Step-by-Step Solution

1. **Identify the Reactants and Products**:
- The reactants are \( \text{FeCr}_2\text{O}_4 \) (chromite), \( \text{Na}_2\text{CO}_3 \) (sodium carbonate), and \( \text{O}_2 \) (oxygen).
- The products are \( \text{Fe}_2\text{O}_3 \) (iron(III) oxide) and \( \text{Na}_2\text{CrO}_4 \) (sodium chromate).

2. **Determine the Type of Reaction**:
- We need to analyze how the reactants are transformed into products. In this case, we see that:
- The iron in \( \text{FeCr}_2\text{O}_4 \) is oxidized to \( \text{Fe}_2\text{O}_3 \).
- The chromium in \( \text{FeCr}_2\text{O}_4 \) is converted to \( \text{Na}_2\text{CrO}_4 \), indicating a change in oxidation state.
- Since there is a transfer of electrons (oxidation of iron and reduction of chromium), this indicates a redox reaction.

3. **Classify the Reaction**:
- This reaction can be classified as a **displacement reaction** because one element (iron) is being displaced from its compound (chromite) by the oxygen, leading to the formation of new products.
- Additionally, since multiple oxidation states are involved, it can also be classified as an **intermolecular redox reaction** where oxidation and reduction occur between different molecules.

4. **Conclusion**:
- The overall reaction is a displacement reaction with redox characteristics. The correct classification for this reaction is that it is a **displacement reaction** and an **intermolecular redox reaction**.

### Final Answer
The reaction \( \text{FeCr}_2\text{O}_4 + \text{Na}_2\text{CO}_3 + \text{O}_2 \rightarrow \text{Fe}_2\text{O}_3 + \text{Na}_2\text{CrO}_4 \) is classified as a **displacement reaction** and an **intermolecular redox reaction**.

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