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Why is that on being heated in excess s...

Why is that on being heated in excess supply of air , K , Rb and Cs form superoxides in preference to oxide and peroxides ?

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`K^(+) , Rb^(+)` and `Cs^(+)` are large cations and superoxide ion `(O_(2)^(-))` is larger than oxide `(O^(2-))` and peroxide `(O_(2)^(2-))` ions . Since due to higher lattice energies , a large cation stabilizes a large anion , therefore , these metals form superoxides in preference to oxides and peroxides .
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Why is that on being heated in excess supply of air , K , Rb and Cs form superoxides in perference to oxide and peroxides ?

when potassium burns in excess supply of air ( oxygen),it forms :-

K, Rb and Cs form which type of compounds with oxygen?

Alkali metals burn in air to form oxides, peroxides and superoxides. Lithium burns in moist air to form normal oxide as the major product. Some lithium nitride is also formed if nitrogen is present. Sodium loses lustre and forms both normal oxide and peroxide, the peroxide being the major product. Rest of all alkali metals form peroxides. All metals can be forced to form oxides, peroxides and superoxides by dissolving in liquid ammonia and bubbling appropriate amount of O_(2) . Which among the following oxides turn red litmus paper blue :

Alkali metals burn in air to form oxides, peroxides and superoxides. Lithium burns in moist air to form normal oxide as the major product. Some lithium nitride is also formed if nitrogen is present. Sodium loses lustre and forms both normal oxide and peroxide, the peroxide being the major product. Rest of all alkali metals form peroxides. All metals can be forced to form oxides, peroxides and superoxides by dissolving in liquid ammonia and bubbling appropriate amount of O_(2) . Which of the following oxides is the strongest oxidising agent :

Assertion : All alkali metals do not form superoxides as one of the main products in excess of air on heating. Reason : Superoxide reacts with carbon monoxide producing a white powder and liberating dioxygen.

Explain why: (a) Lithium on being heated in air mainly forms the monoxide and not peroxide. (b) An aqueous solution of sodium carbonate gives alkaline test.