X and Y are two metals. When burnt in air,X f | vedclass

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(B) When alkali metals are burnt in air,most form oxides,peroxides,or superoxides. $Li$ is unique among alkali metals because it reacts with both $O_2

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$Na$ and $Mg$

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(B) When alkali metals are burnt in air,most form oxides,peroxides,or superoxides. $Li$ is unique among alkali metals because it reacts with both $O_2$ and $N_2$ in the air to form $Li_2O$ (oxide) and $Li_3N$ (nitride). $Na$ forms $Na_2O_2$ (peroxide) as the major product. $Mg$ (an alkaline earth metal) also forms both oxide $(MgO)$ and nitride $(Mg_3N_2)$ when burnt in air. Therefore,the pair $X$ and $Y$ that fits the description is $Na$ and $Mg$.

$X$ and $Y$ are two metals. When burnt in air,$X$ forms only oxide while $Y$ forms oxide and nitride. The metals $X$ and $Y$ may be

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