First slide

Alkali metals

Question

Highly pure dilute solution of sodium in liquid ammonia

Moderate

A

shows blue colour
B

exhibits electrical conductivity
C

acts as reducing agent
D

acts as oxidising agent

Solution

Alkali metals dissolve in liquid ammonia to give deep blue solutions that are conducting in nature. This happens because the alkali metal atom readily loses the valence electron in ammonia solution. Both the cation and the electron combine with ammonia to form ammoniated cation and ammoniated electron

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