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On dissolving moderate amount of sodium ...

On dissolving moderate amount of sodium metal in liquid ammonia at low temperature, which of the following does not occur ?

A

Blue coloured solution is obtained

B

`Na^(+)` ions are formed in the solution

C

Liquid `NH_(3)` becomes good conductor of electricity

D

Liquid ammonia remains diamagnetic

Text Solution

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The correct Answer is:
To solve the question regarding the dissolution of sodium metal in liquid ammonia at low temperature, we will analyze the reactions and properties of the resulting solution step by step. ### Step 1: Understanding the Reaction When sodium metal (Na) is dissolved in liquid ammonia (NH3), it reacts to form sodium ions (Na⁺) and ammoniated electrons (e⁻). The reaction can be represented as: \[ \text{Na} + \text{NH}_3 \rightarrow \text{Na}^+ + \text{e}^- \text{ (ammoniated)} \] ### Step 2: Properties of the Resulting Solution 1. **Formation of Blue Color**: The ammoniated electrons are free electrons that can absorb certain wavelengths of light, leading to the characteristic blue color of the solution. This indicates that the solution is colored due to the presence of these unpaired electrons. 2. **Paramagnetism**: The presence of unpaired electrons in the ammoniated electrons makes the solution paramagnetic. Paramagnetic substances are attracted to magnetic fields due to the presence of unpaired electrons. 3. **Conductivity**: The formation of Na⁺ ions in the solution means that the liquid ammonia becomes a good conductor of electricity, as ions are mobile charge carriers. 4. **Diamagnetism of Liquid Ammonia**: Liquid ammonia itself is typically considered diamagnetic because it does not have unpaired electrons. However, when sodium is added, the solution's properties change due to the presence of ammoniated electrons. ### Step 3: Identifying the Incorrect Statement Now, we need to identify which statement does not occur based on our analysis: - **Option 1**: Blue colored solution is obtained (True) - **Option 2**: Na⁺ ions are formed in the solution (True) - **Option 3**: Liquid NH3 becomes a good conductor of electricity (True) - **Option 4**: Liquid ammonia remains diamagnetic (False) ### Conclusion The statement that does not occur is that liquid ammonia remains diamagnetic. Instead, the presence of ammoniated electrons makes the solution paramagnetic. ### Final Answer The correct answer is that liquid ammonia remains diamagnetic. ---
To solve the question regarding the dissolution of sodium metal in liquid ammonia at low temperature, we will analyze the reactions and properties of the resulting solution step by step. ### Step 1: Understanding the Reaction When sodium metal (Na) is dissolved in liquid ammonia (NH3), it reacts to form sodium ions (Na⁺) and ammoniated electrons (e⁻). The reaction can be represented as: \[ \text{Na} + \text{NH}_3 \rightarrow \text{Na}^+ + \text{e}^- \text{ (ammoniated)} \] ### Step 2: Properties of the Resulting Solution 1. **Formation of Blue Color**: The ammoniated electrons are free electrons that can absorb certain wavelengths of light, leading to the characteristic blue color of the solution. This indicates that the solution is colored due to the presence of these unpaired electrons. ...
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