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Which one of the alkali metals forms only the normal oxide, `M_(2)O`, on heating in air ?A. `Li`B. `Na`C. `Rb`D. `K`

Answer» Correct Answer - A
`Li^(+)` being smallest possessses strong positive field and, thus, combines with small anion `O^(2-)` to form stable `Li_(2)O` compound. The `Na^(+),K^(+)` and `Rb^(+)` being relatively larger exert less strong positive field around them and thus react with larger oxygen anions, `i.e., O_(2)^(2-)` and `O_(2)^(1-)` to form stable oxides.


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