Question

The stability order of oxide, peroxide and superoxide of alkali metal is:

• A. normal oxide > superoxide > peroxide
• B. normal oxide > peroxide > superoxide
• C. superoxide > peroxide > normal oxide
• D. peroxide > normal oxide > superoxide

Answer 1

Answer: (B)

normal oxide > peroxide > superoxide

The stability order of oxide, peroxide and superoxide of alkali metal is normal oxide > peroxide > super oxide.
$\underset{\text{Monoxide ion}}{O^{2-}}+\frac{1}{2}{O}_2\to \underset{\text{Peroxide ion}}{O_2^{2-}}$
$\underset{\text{Peroxide ion}}{O_2^{2-}}+O_2\to \underset{\text{Superoxide ion}}{2\left(O_2^{-}\right)}$