What is true about `N _(2)O_(4)`?

Options

A. It is mixture `N _(2)O_(3)` and `N _(2)O_(5)`.
B. It is absorbed by water to form nitric acid.
C. It is reddish brown gas.
D. It reacts with water to give mixture of two oxoacids of nitrogen.

Explanation

To determine what is true about \( N_2O_4 \), we will analyze each of the provided statements one by one.

### Step 1: Analyze the first statement
**Statement:** It is a mixture of \( N_2O_3 \) and \( N_2O_5 \).

**Analysis:**
- \( N_2O_4 \) is not a mixture of \( N_2O_3 \) and \( N_2O_5 \). Instead, it is formed by the dimerization of \( NO_2 \) (nitrogen dioxide). The reaction can be represented as:
\[ 2 NO_2 \rightleftharpoons N_2O_4 \]
- Therefore, this statement is **false**.

### Step 2: Analyze the second statement
**Statement:** It is absorbed by water to form nitric acid.

**Analysis:**
- \( N_2O_4 \) does not get absorbed by water; rather, it reacts with water. The reaction can be represented as:
\[ N_2O_4 + H_2O \rightarrow HNO_2 + HNO_3 \]
- This indicates that it reacts with water to produce a mixture of nitrous acid (\( HNO_2 \)) and nitric acid (\( HNO_3 \)). Thus, this statement is also **false**.

### Step 3: Analyze the third statement
**Statement:** It is a reddish-brown gas.

**Analysis:**
- \( N_2O_4 \) is actually a colorless gas at room temperature. The reddish-brown color is characteristic of \( NO_2 \) (nitrogen dioxide), which is in equilibrium with \( N_2O_4 \). Therefore, this statement is **false**.

### Step 4: Analyze the fourth statement
**Statement:** It reacts with water to give a mixture of two oxo acids of nitrogen.

**Analysis:**
- As previously mentioned, when \( N_2O_4 \) reacts with water, it produces two oxo acids:
\[ N_2O_4 + H_2O \rightarrow HNO_2 + HNO_3 \]
- This confirms that the statement is **true**.

### Conclusion
After analyzing all the statements, we conclude that the only true statement about \( N_2O_4 \) is that it reacts with water to give a mixture of two oxo acids of nitrogen.

### Final Answer
The correct statement about \( N_2O_4 \) is: **It reacts with water to give a mixture of two oxo acids of nitrogen.**

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