Q16 / 180 · COMEDK 2014 · Chemistry

Sodium dissolves in liquid $\mathrm{NH}_{3}$ to give a deep blue solution. This is due to

  • A
    ammoniated $\mathrm{Na}^{+}$
  • B
    ammoniated $\mathrm{Na}^{-}$
  • C
    formation of $\mathrm{Na}^{+} / \mathrm{Na}^{-}$pair
  • Correct answer
    D
    ammoniated electrons

Solution

$\mathrm{Na}+(x+y) \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Na}\left(\mathrm{NH}_{3}\right)_{x}\right]^{+}+\left[e\left(\mathrm{NH}_{3}\right)_{y}\right]^{-}$. The deep blue colour of the solution is due to the ammoniated electron which absorbs energy in the visible region of light and thus, imparts blue colour to the solution.

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

More s Block Elements Questions