Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) General Subjective Type
Published on: August 13, 2026

We know air mostly contains (O 2 , N 2 ), What happen when group-I and group-II elements of s-block react with exess of air?

Group-I Elements

+ O2 (Major product)

+ N2

(product)

Group-II Elements

+ O2 

(Major product)

+ N2

(product)

Li

………….

……….

Be

…………….

…………….

Na

……..….

……….

Mg

…………….

…………….

K

………..

……….

Ca

…………….

…………….

Rb

………..

……….

Sr

…………….

…………….

Cs

…………

……….

Ba

…………….

…………….

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Text Solution

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The correct answer is:
CHECK THE SOLUTION.

Group-I Elements

+ O2 (Major product)

+ N2

(product)

Group-II Elements

+ O2 

(Major product)

+ N2

(product)

(Only on strong heating)

Li

Li2O (Oxide)

Li3N

Be

BeO

Be3N2

Na

Na2O2 (Peroxide)

It does not    react

Mg

MgO

Mg3N2

K

KO2 (superoxide)

It does not    react

Ca

CaO

Ca3N2

Rb

RbO2

(superoxide)

It does not    react

Sr

SrO2

Sr3N2

Cs

CsO2

(superoxide)

It does not    react

Ba

BaO2

Ba3N2

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