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  • Solve! - s- Block Elements ( Alkali and Alkaline earth metals ) - NEET-2

Which one of the alkali metals, forms only, the normal oxide, M_{2}O on heating in air?

  • Option 1)

    Rb

  • Option 2)

    K

  • Option 3)

    Li

  • Option 4)

    Na

 

Answers (2)

As 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(monooxide)

 

 Only Li among the alkali metals forms a normal oxide Li2O on heating in air.

        2Na +O_{2}\rightarrow Na_{2}O_{2}\ (peroxide)

        M+O_{3}\rightarrow MO_{2}\ \left ( super\ oxide \right )

        M= K,\ Rb,\ Cs


Option 1)

Rb

This option is incorrect

Option 2)

K

This option is incorrect

Option 3)

Li

This option is correct

Option 4)

Na

This option is incorrect

Posted by

Vakul

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Li

 

Posted by

balakrishnan m

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