The main oxides formed on combustion of Li, Na and K in excess of air are, respectively :

  • Option 1)

    Li2O, Na2O and KO2

  • Option 2)

    LiO2, Na2O2 and K2O

     

  • Option 3)

    Li2O2, Na2O2 and KO2

     

  • Option 4)

    Li2O, Na2O2 and KO2

 

Answers (1)

As we learnt in

Action of oxygen on alkali metals -

Nature of oxides formed depends upon the nature of alkali metal

- wherein

2Na+O{_{2}}\rightarrow Na {_{2}} O{_{2}} (peroxide)\\ M+O{_{2}}\rightarrow MO{_{2}}(super\ oxide) (M=K, Rb, Cs)\\ 4Li+O_{2}\rightarrow 2Li_{2}O(mono\ oxide)

 

 Li\:form\:Li_{2}O \: with\:air

Na\:form\:Na_{2}O_{2} \: with\:air

K\:form\:KO_{2} \: with\:air

 


Option 1)

Li2O, Na2O and KO2

This option is incorrect.

Option 2)

LiO2, Na2O2 and K2O

 

This option is incorrect.

Option 3)

Li2O2, Na2O2 and KO2

 

This option is incorrect.

Option 4)

Li2O, Na2O2 and KO2

This option is correct.

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