Step-by-step explanation:C
Combustion reaction defined as reaction of compound with the oxygen gas along with release of the large amount heat,.
[tex]4M_3N_x(s)+7xO_2(g)\rightarrow 4xNO_2(g)+6M_2O_x(s)[/tex]
When compound with nitrogen and metal atoms undergoes combustion reaction it gives nitrogen dioxide gas and solid metallic oxide of the metal as a products.
Compound X is nitrogen dioxide. [tex]NO_2[/tex]
Compound Y is metal oxide, [tex]6M_2O_x[/tex]