p-Block elementsHard

Question

Highly pure dilute solution of sodium in liquid ammonia :

Options

A.shows blue colour
B.exhibits electrical conductivity
C.produces sodium amide
D.produces hydrogen gas

Solution

Pure solution of Na + NH3(l) is blue coloured and highly conducting due formation of ammoniated cation and ammoniated electron.
Na + (x + y)NH3 → [Na(NH3)x]+ + [e(NH3)y]-
                                ammoniated     ammoniated
                                cation                    electron
If impurities like Fe etc. are present, NaNH2 amd H2 are formed.
Na + NH3(l) → NaNH2 + H2 

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