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Q.
Alkali metal superoxides are obtained by the reaction of
The s-Block Elements
Solution:
Alkali metals in liquid ammonia produce solvated electrons
$\underset{\text{alkali metal}}{M} + (x+y) NH_3 \rightarrow \underset{\text{Ammoniated metal ion}}{[M(NH_3)]^+} + \underset {\text{Ammoniated electron}}{[e(NH_3)]^-} $
Solvated electrons can reduce $O_2$ molecule to superoxide ion.
$[e(NH_3)_y]^- + \rightarrow \underset {\text{Superoxide ion}}{O^-_2} + _yNH_3 $
These superoxide ions can combine with solvated metal ion to give alkali metal superoxide
$[M(NH_3)_x]^+ + O^-_2 \rightarrow \underset {\text{alkali metal superoxide}}{MO_2} + _xNH_3 $