A series of six nitrates(V) hydrates of 4d-metals as well as mercury and cadmium thermal decomposition was examined by DTA,
TG and EGA techniques. It was found that thermal decomposition of d-metals nitrate(V) hydrates proceeds in three stages: partial
dehydration, oxo-nitrates and hydroxide nitrates formation and metal oxides formation. General chemical equations for all
decomposition stages were proposed. It was found that dehydration of hydrated salts is accompanied by partial decomposition
of nitrate(V) groups.