When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to
Alkali metals like sodium dissolve in liquid ammonia to give a deep blue colour. The reaction can be given as
M + (x+y)NH3 → [M(NH3)x]+ + [e(NH3)y]-
The deep blue colour is due to the ammoniated electron. It absorbs energy in the visible region of light and thus imparts blue colour to the solution. The correct answer is (i).