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When does the blue coloured ammonia solution (of alkali metals) changes to bronze colour? |
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Answer» Solution :(i) Alkali metals dissolve in liquid ammonia to give deep blue solutions that are conducting in nature (ii) The blue colour of the solution is due to the ammoniated electron which absorbs ENERGY in the visible region of light and thus imparts blue colour to the solution. (iii) The solutions are paramagnetic and on standing slowly liberate hydrogen resulting in the formation of amide. (IV) In CONCENTRATED solution, the blue colour change to bronze colour and BECOME diamagnetic. |
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