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A student is doing an experiment in the laboratory using sodium. Suddenly, a piece of sodium falls into liquid ammonia.
(a) What changes can you observe in liquid ammonia?
(b) What is the reason for the change?
(c) If the solution is kept for a long time it is changed into bronze colour. Why?

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(a) When sodium put in liquid ammonia, it dissolves to give blue solution.
(b) Ammoniated electron is responsible for the blue colour.
(c) Dúe to the formation of .NaNH_2.
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