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Question

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


A
normal oxide > superoxide > peroxide
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B
normal oxide > peroxide > superoxide
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C
superoxide > peroxide > normal oxide
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D
peroxide > normal oxide > superoxide
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Solution

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

Chemistry

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