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One reason on heating in excess supply o...

One reason on heating in excess supply of air K, Rb and Cs from superoxide on preference to oxide and peroxides?

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K, Rb and Cs are more reactive therefore, they form superoxide in preference to oxides and peroxides `K^(+), Rb^(+)` and `Cs^(+)` ions are large cations and superoxides ion `O_(2)^(-)` is also large. Larger cations stabilize larger anions, therefore, they form superoxide.
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