JEE Main 2016 · 3 Apr · Shift 1 · Chemistry Q44

ChemistrySingle correct+4 / -1Question 44 of 90

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

\ce{Li2O}

\ce{Na2O}

and

\ce{KO2}

\ce{LiO2}

\ce{Na2O2}

and

\ce{K2O}

\ce{Li2O2}

\ce{Na2O2}

and

\ce{KO2}

\ce{Li2O}

\ce{Na2O2}

and

\ce{KO2}

Answer and worked solution

Official answer: D

Burnt in excess air, lithium gives the normal oxide $\ce{Li2O}$ , sodium the peroxide $\ce{Na2O2}$ and potassium the superoxide $\ce{KO2}$ .

JEE Main 2016 · 3 Apr · Shift 1, Chemistry question 44