The example of homogeneous catalysis is

Options

A. Formation of `NH_(3)` in Haber's process
B. Formation of NO in Ostwald's process
C. Formation of `SO_(3)` in Lead chamber process
D. Formation of `SO_(3)` in Contact process

Answer

To determine an example of homogeneous catalysis, we need to understand the definition and characteristics of homogeneous and heterogeneous catalysis.

### Step-by-Step Solution:

1. **Understand Homogeneous Catalysis**:
- Homogeneous catalysis occurs when the catalyst and the reactants are in the same phase (i.e., both are gases, both are liquids, or both are solids).

2. **Analyze the Given Examples**:
- **Formation of NH3**: The reaction is \(N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)\) with iron as a catalyst. Here, the reactants are gases, but the catalyst (iron) is a solid. Therefore, this is an example of heterogeneous catalysis.

- **Formation of NO**: The reaction is \(4NH_3(g) + 5O_2(g) \rightarrow 4NO(g) + 6H_2O(g)\) with platinum as a catalyst. Again, the reactants are gases, and platinum is a solid, making this another example of heterogeneous catalysis.

- **Formation of SO3 in the Contact Process**: The reaction is \(2SO_2(g) + O_2(g) \rightarrow 2SO_3(g)\) with nitric oxide (NO) as a catalyst. Here, all species involved (SO2, O2, SO3, and NO) are gases. Since the catalyst is also a gas, this is an example of homogeneous catalysis.

3. **Conclusion**:
- The only example of homogeneous catalysis from the options provided is the formation of SO3 in the Latchamber process, where the catalyst (NO) is in the same phase as the reactants.

### Answer:
The example of homogeneous catalysis is the formation of SO3 in the Latchamber process.

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