A typical sesquioxide of $R b / R b_{4} O_{6}$ can be represented as :

[R b_{4} {(O_{2})}^{2 -} {(O_{2})}_{2}^{2}]

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R b_{4} {(O^{2 -})}_{6}

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R b O_{2}, {(R b_{2} O_{2})}_{2}

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R b_{2} O . {(R b_{2} O_{2})}_{2}

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Solution

The correct option is A $[R b_{4} {(O_{2})}^{2 -} {(O_{2})}_{2}^{2}]$
A sesquioxide is an oxide containing three atoms of oxygen with two atoms of another element. Many sesquioxides contain the metal in the +3 oxidation state and the oxide ion, e.g., $A l_{2} O_{3}, L a_{2} O_{3}$ . The alkali metal sesquioxides are exceptions and contain both peroxide, $(O_{2}^{2})$ and superoxide, $(O^{2})$ ions, like $R b_{2} O_{3}$ is formulated $[(R b^{+})_{4} (O_{2}^{2}) (O_{2}^{2})_{2}]$ .

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