question_answer

Which one of the alkali metals, forms only, the normal oxide, \[{{M}_{2}}O\] on heating in air? [AIPMT (S) 2012]

A) Rb

B) K

C) Li

D) Na

Correct Answer: C

Solution :

[c] Li is the alkali metal which forms only normal oxide  when heated in air. Sodium, when heated in air, forms peroxide while heavier alkali metals form superoxide as the major product.