[X] and [Y] are two nitrates of alkali metals [X] and [Y] on decomposition produces oxides and nitrites respectively. Here, [X] and [Y] refer to

Only lithium nitrate on decomposition produces lithium oxide whereas other alkali metal nitrates on decomposition produces alkali metal nitrites. 3 2 2 2 3 2 2 4LiNO 2Li O NO O 2KNO 2KNO O -> ->