FeCr_2O_7 " react with " Na_2CO_3` gives the product:

Options

A. `Na_2CrO_4`
B. `Na_2Cr_2O_7`
C. `Fe_3O_4`
D. FeO

Answer

To solve the problem of what happens when ferric chromate (FeCr₂O₇) reacts with sodium carbonate (Na₂CO₃), we can follow these steps:

### Step 1: Write the Reactants
We start with the reactants:
- Ferric Chromate: FeCr₂O₇
- Sodium Carbonate: Na₂CO₃

### Step 2: Identify the Reaction
When ferric chromate reacts with sodium carbonate in the presence of oxygen, it undergoes a redox reaction. The products of this reaction will include sodium chromate (Na₂CrO₄), iron(III) oxide (Fe₂O₃), and carbon dioxide (CO₂).

### Step 3: Write the Unbalanced Chemical Equation
The unbalanced equation for the reaction can be written as:
\[ \text{FeCr}_2\text{O}_7 + \text{Na}_2\text{CO}_3 + \text{O}_2 \rightarrow \text{Na}_2\text{CrO}_4 + \text{Fe}_2\text{O}_3 + \text{CO}_2 \]

### Step 4: Balance the Chemical Equation
To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. The balanced equation is:
\[ 4 \text{FeCr}_2\text{O}_7 + 8 \text{Na}_2\text{CO}_3 + \text{O}_2 \rightarrow 8 \text{Na}_2\text{CrO}_4 + 2 \text{Fe}_2\text{O}_3 + 8 \text{CO}_2 \]

### Step 5: Identify the Products
From the balanced equation, we can see the products formed:
- Sodium Chromate: Na₂CrO₄
- Iron(III) Oxide: Fe₂O₃
- Carbon Dioxide: CO₂

### Conclusion
The main product of the reaction between ferric chromate and sodium carbonate is sodium chromate (Na₂CrO₄).

---