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  • When heated in air, the alkali metals form various oxides. Mention the oxides formed by Li, Na and K.

When heated in air, the alkali metals form various oxides. Mention the oxides formed by Li, Na and K.

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Reactivity of alkali metals with O_{2}  increases down the group. These elements give 3 types of oxides- normal oxide, peroxide and superoxide.

4Li+O_{2} \rightarrow 2Li_{2}O Lithium oxide

  6Na+2O_{2} \rightarrow Na_{2}O_{2} Sodium peroxide+2 Na_{2}O Sodium oxide

 8K+2O_{2} \rightarrow KO_{2} Superoxide+K_{2}O Peroxide +K_{2}O (Normal oxide)

 

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