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16/12/2021 11:48 am
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The main oxides formed on combustion of Li, Na and K in excess of air are, respectively
(a) Li2O2, Na2O2 and KO2
(b) Li2O, Na2O2 and KO2
(c) Li2O, Na2O and KO2
(d) LiO2, Na2O2 and K2O
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16/12/2021 11:53 am
Correct answer: (b) Li2O, Na2O2 and KO2
Explanation:
On heating with excess of air Li, Na and K forms following oxides
4Li + O2 → 2Li2O (Lithium monoxide)
4Na + O2 \(\overset{575K}{\longrightarrow}\) Na2O2 (Sodium peroxide)
K + O2 → KO2 (Potassium superoxide)