Which of the following metal nitrate will give metal and oxygen on heating?

When two moles of silver nitrate are heated, two moles of nitrogen dioxide, two moles of silver metal, and one mole of oxygen are produced as the breakdown products.

Trivalent metal oxides, such as aluminium nitrate, break down when heated, producing aluminium oxide, nitrogen dioxide, and oxygen as byproducts.

The following reaction is obtained when silver nitrate is heated.

${\mathrm{AgNO}}_3\stackrel{\mathrm{\Delta }}{\to }\mathrm{Ag}+\frac{1}{2}{\mathrm{O}}_2+{\mathrm{N}}_2$

Hence, ${\mathrm{AgNO}}_3$ (Silver nitrate) gives metal (Ag) and oxygen on heating.