Question

Which one of the alkali metals forms only the normal oxide m2o on heating in air?

Answer 1

When alkali metals heated in atmosphere of oxygen, the alkali metals ignite and form oxides. On combustion Li forms Li2O; sodium gives the peroxide Na2O2 and potassium and rubidium give super oxide (MO2).

Answer 2

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lithium and sodium are the metals which form normal oxide when heated with air.

lithium oxide - Li2O
sodium oxide - Na2O

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