What is the oxidizing agent of f this chemical process? #Fe + Cu(NO_3)_2 → Fe(NO_3)_2 + Cu#
An oxidizing agent formally ACCEPTS electrons. Therefore, here, the agent is
Oxidation involves the formal loss of electrons. Reduction involves the formal gain of electrons. Since matter (including electrons) is conserved in a chemical reaction, each oxidation is accompanied by a reduction, and each reduction by an oxidation.
In your equation, you have an electron-rich, elemental metal, i.e.