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18/09/2020 8:04 pm
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On combustion of Li, Na and K in excess of air, the major oxides formed, respectively, are :
(1) Li2O, Na2O and K2O2
(2) Li2O2, Na2O2 and K2O2
(3) Li2O, Na2O2 and K2O
(4) Li2O, Na2O2 and KO2
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18/09/2020 8:05 pm
(4) Li2O, Na2O2 and KO2
Explanation:
On heating in excess air Li form oxide sodium form peroxide while K, Rb, Cs form superoxide.