When sodium (Na) metal is dissolved in liquid ammonia `("NH"_(3))`, it imparts a blue colour to the solution. This blue colouration is due to

Options

A. liquid `NH_(3)`
B. `[Na(NH_(3))_(x)]^(+)`
C. `NaNH_(2)`
D. `[bar(e)(NH_(3))_(x)]^(-)`

Answer

D

Explanation

On dissolving sodium (Na) metal in liquid ammonia `(NH_(3))` blue colour solution is obtained due to formation of ammoniated electrons which absorbs energy in the visible region. Reaction involved is
`Na+(x+y)NH_(3)to[Na(NH_(3))_(x)^(+)]+[e(NH_(3))_(y)]^(-) `