Photochemical decomposition off `HNO_(3)` produces:

Options

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

Answer

To solve the question regarding the photochemical decomposition of HNO₃ (nitric acid), we can follow these steps:

### Step 1: Understand Photochemical Decomposition
Photochemical decomposition refers to a chemical reaction that occurs in the presence of light (usually sunlight). In this case, we are looking at the decomposition of nitric acid when exposed to light.

**Hint:** Remember that photochemical reactions often involve the breaking of chemical bonds due to the energy provided by light.

### Step 2: Write the Reaction
The photochemical decomposition of nitric acid can be represented by the following equation:
\[ 4 \, HNO_3 \, \xrightarrow{light} \, 4 \, NO_2 + 2 \, H_2O + O_2 \]

**Hint:** Look for the products that are typically formed when acids decompose under light; this often includes gases.

### Step 3: Identify the Products
From the balanced equation, we can see that the products of the photochemical decomposition of nitric acid are:
- Nitrogen dioxide (NO₂)
- Water (H₂O)
- Oxygen (O₂)

**Hint:** Focus on the gaseous products, as they are often the main focus in decomposition reactions.

### Step 4: Analyze the Options
Now, let's evaluate the options provided in the question:
- Option A: Nitrogen (N₂) - Not produced.
- Option B: Nitrous oxide (N₂O) - Not produced.
- Option C: Nitrogen dioxide (NO₂) - Produced.
- Option D: Oxygen (O₂) - Produced.

**Hint:** Cross-check the products from the balanced equation with the options given.

### Step 5: Conclusion
The correct answers to the question "Photochemical decomposition of HNO₃ produces" are:
- C: Nitrogen dioxide (NO₂)
- D: Oxygen (O₂)

**Final Answer:** The photochemical decomposition of HNO₃ produces nitrogen dioxide and oxygen.

---