Thermal decomposition of Nickel nitrate | Ni (NO3) 2 = NiO + 2NO2 + 1/2O2
Nickel nitrate was taken in the form of crystalline hydrate, so when heated it forms a solution. At temperatures above 200°C Nickel nitrite is formed, and then - oxide. The reaction equation, of course, does not show the complexity of the processes.
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https://chemiday.com/reaction/3-1-0-9102
Ni(NO3) 2 = No + 2NO2 + 1/2O2