When dry ammonia gas is passed over heated sodium (out of contact of air) the product forms is

Options

A. sodium hydride
B. sodium nitride
C. sodamide
D. sodium cyanamide

Answer

To solve the question of what product forms when dry ammonia gas is passed over heated sodium (out of contact with air), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in this reaction are sodium (Na) and dry ammonia (NH₃).

2. **Understand the Conditions**:
- The reaction occurs when sodium is heated and is out of contact with air. This is important because sodium reacts vigorously with moisture and oxygen.

3. **Write the Reaction**:
- When sodium reacts with dry ammonia, the reaction can be represented as:
\[ \text{Na} + \text{NH}_3 \xrightarrow{\text{heat}} \text{NaNH}_2 + \frac{1}{2} \text{H}_2 \]
- Here, sodium (Na) reacts with ammonia (NH₃) to form sodium amide (NaNH₂) and hydrogen gas (H₂).

4. **Identify the Product**:
- The primary product formed in this reaction is sodium amide (NaNH₂).

5. **Conclusion**:
- Therefore, the product formed when dry ammonia gas is passed over heated sodium (out of contact with air) is sodium amide (NaNH₂).

### Final Answer:
The product formed is sodium amide (NaNH₂).

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