Chemical formula of ferric oxide is:

Options

A. FeO
B. `Fe_(2)O_(3)`
C. `Fe_(3)O_(4)`
D. none of these

Explanation

To determine the chemical formula of ferric oxide, we will follow these steps:

### Step 1: Identify the elements involved
Ferric oxide consists of iron (Fe) and oxygen (O).

### Step 2: Determine the oxidation states (valencies)
- The oxidation state of iron in ferric oxide is +3 (this is referred to as the ferric ion).
- The oxidation state of oxygen is -2.

### Step 3: Use the criss-cross method to find the formula
- Write down the valencies:
- Iron (Fe): +3
- Oxygen (O): -2

Now, we will use the criss-cross method:
- The valency of iron (+3) becomes the subscript for oxygen.
- The valency of oxygen (-2) becomes the subscript for iron.

### Step 4: Write the formula
- From the criss-cross method:
- Iron (Fe) will have a subscript of 2 (from the -2 of oxygen).
- Oxygen (O) will have a subscript of 3 (from the +3 of iron).

Thus, the chemical formula for ferric oxide is **Fe2O3**.

### Conclusion
The chemical formula of ferric oxide is **Fe2O3**.

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