Except LiNO3, nitrates of IA group on heating give,

Except LiNO3, the remaining alkali metal nitrates on thermal decomposition liberates only one gaseous product, which is4LiNO3→∆2Li2O+4NO2+O2 2NaNO3→∆2NaNO2+O2LiNO3 decomposes differently when compared to the nitrates of other IA group elements.