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All alkali metals dissolve in liquid amm...

All alkali metals dissolve in liquid ammonia giving highly conducting ____ solutions.

A

colorless

B

deep blue

C

yellow

D

black

Text Solution

Verified by Experts

The correct Answer is:
B
Dilute solutions of alkali metals in liquid `NH_(3)` are dark blue in color and contain ammoniated metal ions and ammoniated electrons :
`M+(x+y)NH_(3)to M^(+)(NH_(3))_(x)+e^(-)(NH_(3))_(y)`
When light falls on ammoniated electrons, they get excited to higer energy levels by absorbing the red part of visible light. As a result, the transmitted light is blue imparting blue color to the solution.
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