Dinitrogen can be purified from the impurities of `NO` and `NH_(3)` by passing through :

Options

A. concentrated `HCl`
B. alkaline solution of phrogallol.
C. an acidified solutin of potassium dichromate.
D. an aqueous solution of `KOH`.

Explanation

To purify dinitrogen (N₂) from the impurities of nitrogen oxide (NO) and ammonia (NH₃), we can use an acidified solution of potassium dichromate (K₂Cr₂O₇). Here’s the step-by-step solution:

### Step 1: Understand the Impurities
Identify the impurities present in the dinitrogen gas:
- Nitrogen oxide (NO)
- Ammonia (NH₃)

### Step 2: Use of Acidified Potassium Dichromate
We will use an acidified solution of potassium dichromate (K₂Cr₂O₇) to purify dinitrogen. The potassium dichromate is typically acidified with sulfuric acid (H₂SO₄).

### Step 3: Reaction with Ammonia
When ammonia (NH₃) is passed through the acidified potassium dichromate solution, it reacts to form ammonium sulfate:
\[ \text{2 NH}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{(NH}_4)_2\text{SO}_4 \]
This reaction effectively removes ammonia from the mixture.

### Step 4: Reaction with Nitrogen Oxide
The potassium dichromate also oxidizes nitrogen oxide (NO) in the presence of sulfuric acid:
\[ \text{4 NO} + \text{O} \rightarrow \text{4 HNO}_3 \]
Here, the nascent oxygen produced from the acidified potassium dichromate reacts with NO to form nitric acid (HNO₃), which is a liquid and can be easily separated from dinitrogen.

### Step 5: Separation of Dinitrogen
After the reactions, the dinitrogen (N₂) remains unreacted and can be collected, while both impurities (NO and NH₃) are removed in the form of ammonium sulfate and nitric acid.

### Conclusion
Thus, dinitrogen can be purified from the impurities of NO and NH₃ by passing through an acidified solution of potassium dichromate (K₂Cr₂O₇).

### Final Answer
The answer is an acidified solution of potassium dichromate.

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