1) The main oxides formed on combustion of Li, Na, and K in excess of air respectively are A) LiO2,Na2O2and K2O B) Li2O2,Na2O2andKO2 C) Li2O,Na2O2 and KO2 D) Li2O ,Na2O and KO2 Answer: Option CExplanation:2Li+12O2(g)→Li2O 2Na+O2(g)→Na2O2 K+O2(g)→KO2