Which is responsible for the blue colour of alkali metals in liquid ammonia?

What is the reason behind the blue colouration of alkali metals with liquid ammonia? M+(x+y)NH_(3)to[M(NH_(3))_(x)]^(+)+[e(NH_(3))_(y)]^(-)

What is responsible for the blue colour of the solution of alkali metali in liquid ammonia? Give chemical equation also.

How alkali metals react with liquid ammonia?

Which of the following statements is wrong for the solution of alkali metals in liquids ammonia

The alkali metals dissolve in ammonia to give a deep blue solution which is cnducting in nature. M+(x+y)NH_(3)to[M(NH_(3))_(x)]^(2+)+2[e(NH_(3))_(y)]^(-) which of the followin is not true about the solutions of alkali metals in liquid ammonia?