1.

In the excess of air, the major oxides formed by Li, Na and K are Li_(2)O, Na_(2)O_(2)and KO_(2) respectively. Arrange all the given oxides in the decreasing order of their stability.

Answer»

`Li_(2)O gt Na_(2)O_(2)gt KO_(2)`
`KO_(2)gt Na_(2)O_(2)gt Li_(2)O`
`Na_(2)O_(2)gt KO_(2)gt Li_(2)O`
`Li_(2)O gt KO_(2)gt Na_(2)O_(2)`

SOLUTION :The increasing STABILITY of the PEROXIDE or superoxide, as the size of the metal ion increases, is DUE to the stabilisation of large anions by larger cations.


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