Ammonia can not be collected over water because

Options

A. It reacts with water
B. It is soluble in water
C. It explodes in water
D. None of these

Explanation

**Step-by-Step Solution:**

1. **Understanding Ammonia's Properties:**
Ammonia (NH₃) is a colorless gas with a characteristic pungent odor. It is known for its solubility in water.

2. **Reaction with Water:**
When ammonia is introduced to water, it undergoes a reaction to form ammonium hydroxide (NH₄OH). This reaction can be represented as:
\[ NH_3(g) + H_2O(l) \rightarrow NH_4OH(aq) \]

3. **Solubility of Ammonia:**
Due to the formation of hydrogen bonds between ammonia and water molecules, ammonia is highly soluble in water. This means that when you try to collect ammonia over water, it will dissolve rather than collect as a gas.

4. **Conclusion:**
Since ammonia is soluble in water, it cannot be effectively collected over water. Therefore, the correct answer to the question is option B: "It is soluble in water."

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