Which pair of elements on combustion in air g | vedclass

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Question

(B) Alkali metals react with oxygen to form different types of oxides depending on their size and ionization energy. $Li$ forms only the monoxide $(Li

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$K, Rb$

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(B) Alkali metals react with oxygen to form different types of oxides depending on their size and ionization energy. $Li$ forms only the monoxide $(Li_2O)$. $Na$ forms the peroxide $(Na_2O_2)$. $K$, $Rb$, and $Cs$ form superoxides $(MO_2)$ when burnt in excess of air. Therefore, the pair of elements that form superoxides is $K$ and $Rb$.

Which pair of elements on combustion in air give superoxides?

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