The oxidation state of Na, K, Rb respectively in $N a_{2} O_{2}, K O_{2}, R b O_{2}$ is :

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Solution

In all these oxides the oxidation state of the alkali metal $(N a_{2} O_{2} - peroxide, K O_{2} - superoxide, R b O_{2} - superoxide)$ is +1.
Hence, correct option is a.

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