Question

What happens when Copper nitrate is heated?

Answer 1

When Copper nitrate ($\mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2$) undergoes heating, it decomposes into copper oxide, nitrogen dioxide and oxygen.
$2\mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2\to 2\mathrm{CuO}+4{\mathrm{NO}}_2+{\mathrm{O}}_2$
These compounds are produced due to the thermal decomposition of copper nitrate.