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The S-Block Elements

Question
CBSEENCH11008278
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Which one of the alkali metals, forms only the normal oxide, M2O on heating in air?

  • Rb

  • K

  • Li

  • Na

Solution

C.

Li

Li is the alkali metal which forms only normal oxide Li2O when heated in air.
2Li +1/2 O2 ---> Li2O
sodium, when heated in air forms peroxide while heavier alkali metals form superoxide as the major product. 

Some More Questions From The s-Block Elements Chapter

The softness of group 1 elements increases down the group with increasing atomic number. Give reason. 

Which is the most reactive alkali metal and why?

Why alkali metals do not form M2+ ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

Why are alkali metal ions diamagnetic and colourless?

Why are alkali metals the most electropositive in nature?

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