Question

On dissolving moderate amount of sodium metal in liquid NH₃ at low temperature, which one of the following does not occur? 

(a) Blue coloured solution is obtained. 

(b) Na⁺ ions are formed in the solution. 

(c) Liquid NH₃ becomes good conductor of electricity. 

(d) Liquid ammonia remains diamagnetic

Answer 1

The correct option is (d) Liquid ammonia remains diamagnetic.

Explanation:

The alkali metals dissolve in liquid ammonia without evolution of hydrogen. The colour of the dilute solution is blue and is paramagnetic in nature. 

M --> M⁺ (in liquid ammonia) + e^- (ammoniated) 

M + (x +y) NH₃ ---> [M(NH₃)_x]⁺ + e^- (NH₃)_y solvated electron.