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  • Identify the incorrect statement about alkali metals.   Option: 1 Alkali metal dissolved in liquid ammonia solution is paramagnet

Identify the incorrect statement about alkali metals. 

 

Option: 1

Alkali metal dissolved in liquid ammonia solution is paramagnetic in nature 

 


Option: 2

Alkali metal dissolved in liquid ammonia gives blue colour to the solution 

 


Option: 3

Alkali metal dissolved in liquid ammonia has lesser conductivity than pure metals.  

 


Option: 4

Alkali metal dissolved in liquid ammonia has similar conductivity to that of pure metals 


Answers (1)

best_answer

Alkali metals dissolve in liquid ammonia to gives ammoniated electrons.
\mathrm{M}+(\mathrm{x}+\mathrm{y}) \mathrm{NH}_3 \rightarrow\left[\mathrm{M}\left(\mathrm{NH}_3\right) _\mathrm{x}\right]^{+}+\left[\mathrm{e}\left(\mathrm{NH}_3\right) _\mathrm{y}\right]^{-}

These ammoniated electrons will absorb energy in the visible region of light and gives blue colour to the solution. These ammoniated electrons are responsible for the paramagnetic nature of the solution.  Due to the presence of free electrons their conductivity is very similar to pure metals.

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