The s-Block Elements

The s-Block Elements

Question

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

  • LiO2, Na2O2 and K2O

  • LiO2, Na2O2 and KO2

  • LiO, Na2O2 and KO2

  • LiO, Na2O and KO2

Answer

C.

LiO, Na2O2 and KO2

2 Li space plus space 1 half straight O subscript 2 space left parenthesis straight g right parenthesis space rightwards arrow Li subscript 2 straight O
2 Na space plus space straight O subscript 2 left parenthesis straight g right parenthesis space rightwards arrow Na subscript 2 straight O subscript 2
straight K space plus space straight O subscript 2 space left parenthesis straight g right parenthesis space rightwards arrow space KO subscript 2 space left parenthesis straight g right parenthesis

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