Sodium gives blue colour in `NH_(3)` solution. This blue colour is due to

Iodine gives blue colour with

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

The blue colour of sky is due to :

The blue colour of sky is due to-

Protein gives blue colour with

Alkali metals readily dissolve in liquid ammonia to give blue coloured solutions. The blue colour is believed to be due to