Which of the following compounds will leave a metal residue when heated?

oluebube008

3 months ago

When these compounds are heated:
AgNO₃ (Silver nitrate)
On heating, it decomposes to metallic silver, nitrogen dioxide, and oxygen:
Ag (silver) is a metal, so it remains as a metal residue.
Cu(NO₃)₂ (Copper(II) nitrate)
Leaves CuO (copper(II) oxide), not the metal.
K₂CO₃ (Potassium carbonate)
It is thermally stable and does not decompose easily when heated.
CaCO₃ (Calcium carbonate)
Leaves CaO (calcium oxide), which is not a metal.