When heated `NH_(3)` is passed over CuO gas evolved is

Options

A. `N_(2)`
B. `N_(2)O`
C. `HNO_(3)`
D. `NO_(2)`

Answer

To determine the gas evolved when heated ammonia (NH₃) is passed over cupric oxide (CuO), we can analyze the chemical reaction that takes place.

### Step-by-Step Solution:

1. **Identify the Reactants**:
The reactants in this reaction are ammonia (NH₃) and cupric oxide (CuO).

2. **Write the Balanced Chemical Equation**:
When ammonia is heated with cupric oxide, a redox reaction occurs. The balanced equation for this reaction is:
\[ 2 \, NH_3(g) + CuO(s) \rightarrow N_2(g) + Cu(s) + H_2O(g) \]

3. **Identify the Products**:
From the balanced equation, we can see that the products of the reaction are nitrogen gas (N₂), solid copper (Cu), and water vapor (H₂O).

4. **Determine the Gas Evolved**:
The gas evolved in this reaction is nitrogen gas (N₂).

5. **Conclusion**:
Therefore, when heated ammonia is passed over cupric oxide, the gas evolved is nitrogen (N₂).