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  • Which among the following is incorrect statement regarding alkali in liquid ammonia solution?  Option: 1 Increasing concentration decr

Which among the following is incorrect statement regarding alkali in liquid ammonia solution?

 

Option: 1

Increasing concentration decreases the conductivity of solution 

 


Option: 2

Increasing concentration forms metal ion clusters

 


Option: 3

On concentrating the solution, it gives copper-bronze colour 

 


Option: 4

None of the above


Answers (1)

best_answer

Alkali metal dissolve in liquid ammonia to form deep blue solution which has free electrons or 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]^{-}

On increasing its concentration, they group together and form metal ion clusters where the opposite spin electrons associate to form diamagnetic electron pairs. This will reduce the conductivity of the solution and changes the colour of the solution to copper-bronze colour. 

Hence, none of the given statements is incorrect.

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