Question

On dissolving moderate amount of sodium metal in liquid $NH_3$ 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 $NH_3$ becomes good conductor of electricity
• D. Liquid ammonia remains diamagnetic

Answer 1

Answer: (D)

The alkali metals dissolve in liquid ammonia without evolution of hydrogen. The colour of the dilute solution is blue and are paramagnetic in nature.
$M\to M^{+}$ (in liquid ammonia) $+ e^{-}$
$M + \left(x + y\right)NH_{3} \to \left[M\left(NH_{3}\right)_{x} \right]^{+}+$ $\underset{\text{solvated electron}}{e^{-} (NH_3)_{y}}$