11th Class Chemistry The s-Block Elements

  • question_answer 67)   When heated in air, the alkali metals form various oxide. Mention the oxides formed by Li, Na and K.

    Answer:

      The effect of atmosphere increases from Li to Cs. Affinity towards oxygen of alkali metals is high and increases from Li to Cs. On heating, lithium forms monoxide, \[L{{i}_{2}}O;\] sodium forms the peroxide, \[N{{a}_{2}}{{O}_{2}}\] and potassium superoxide\[K{{O}_{2}}\]. \[4Li+{{O}_{2}}\to 2L{{i}_{2}}O(Lithium\,oxide)\] \[4Na+{{O}_{2}}\to \underset{SOdium\,oxide}{\mathop{2N{{a}_{2}}O}}\,\xrightarrow{{{O}_{2}}}\underset{Sodium\,peroxide}{\mathop{N{{a}_{2}}{{O}_{2}}}}\,\] \[4K+{{O}_{2}}\to 2{{K}_{2}}O\xrightarrow{{{O}_{2}}}{{K}_{2}}{{O}_{2}}\xrightarrow{{{O}_{2}}}\underset{\begin{smallmatrix}  Potassium \\  \text{superoxide} \end{smallmatrix}}{\mathop{{{K}_{2}}{{O}_{2}}}}\,\]

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