Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • Help me answer: The main oxides formed on combustion of Li, Na and K in excess of air are, respectively :

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

  • Option 1)

    Li2O, Na2O and KO2

  • Option 2)

    LiO2, Na2O2 and K2O

     

  • Option 3)

    Li2O2, Na2O2 and KO2

     

  • Option 4)

    Li2O, Na2O2 and KO2

 

Answers (1)

best_answer

As we 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(mono\ oxide)

 

 Li\:form\:Li_{2}O \: with\:air

Na\:form\:Na_{2}O_{2} \: with\:air

K\:form\:KO_{2} \: with\:air

 


Option 1)

Li2O, Na2O and KO2

This option is incorrect.

Option 2)

LiO2, Na2O2 and K2O

 

This option is incorrect.

Option 3)

Li2O2, Na2O2 and KO2

 

This option is incorrect.

Option 4)

Li2O, Na2O2 and KO2

This option is correct.

Posted by

divya.saini

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main 2025 chemistry needs conceptual understanding; 5 tips to score high
anam-khan

JEE Main 2025 exam city intimation slip for session 1 soon; paper pattern, exams from January 22
anam-khan

JEE Main Maths 2025: Five tips to score high marks in ‘toughest’ subject; most important chapters

Latest Question