Q49 / 180 · AIIMS 2003 · Chemistry

On dissolving moderate amount of sodium metal in liquid $\mathrm{NH}_3$ at low temperature, which one of the following does not occur?

  • A
    Blue coloured solution is obtained.
  • B
    $\mathrm{Na}^{+}$ions are formed in the solution.
  • C
    Liquid $\mathrm{NH}_3$ becomes good conductor of electricity.
  • Correct answer
    D
    Liquid ammonia remains diamagnetic.

Solution

The alkali metals dissolve in liquid ammonia without evolution of hydrogen. The colour of the dilute solution is blue and are paramagnetic in nature. $M \rightarrow M^{+}$(in liquid ammonia) $+e^{-}$(ammoniated) $M+(x+y) \mathrm{NH}_3 \rightarrow\left[M\left(\mathrm{NH}_3\right)_x\right]^{+}+e^{-}\left(\mathrm{NH}_3\right)_y$ solvated electron

Hence, the correct answer is option: 'D'.

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