Which metals forms amide with `NH_(3)` at `300^(@)C`

Options

A. Mg
B. Pb
C. Al
D. Na

Explanation

To determine which metals form amides with ammonia (NH₃) at 300°C, we can follow these steps:

### Step 1: Identify the metals that can react with ammonia
We need to consider alkali metals and alkaline earth metals, as they are known to react with ammonia under certain conditions.

### Step 2: Consider the reaction conditions
The question specifies a temperature of 300°C. At this temperature, certain metals can react with ammonia to form amides.

### Step 3: Write the general reaction
When a metal reacts with ammonia, the general reaction can be represented as:
\[ \text{Metal} + \text{NH}_3 \rightarrow \text{Metal Amide} + \text{H}_2 \]

### Step 4: Identify the specific metal
From the common metals, sodium (Na) is known to react with ammonia at elevated temperatures to form sodium amide (NaNH₂).

### Step 5: Write the balanced equation
The balanced equation for the reaction of sodium with ammonia can be written as:
\[ 2 \text{Na} + 2 \text{NH}_3 \rightarrow 2 \text{NaNH}_2 + \text{H}_2 \]

### Conclusion
Thus, the metal that forms an amide with NH₃ at 300°C is sodium (Na).