Q.What is the reaction involving transfer of electrons from one chemical species to another called?

An electrochemical cell consists of two electronic conductors (metal plates or graphite rods) dipped into an electrolytic conductor, driven by a redox reaction split into an oxidation half reaction (loss of electrons) at one electrode and a reduction half reaction (gain of electrons) at the other; the overall cell reaction is their sum. The cathode is, by definition, the electrode where reduction occurs; the anode is where oxidation occurs — this definition applies regardless of cell type, though the electrical sign differs between the two. There are two fundamentally different types: an electrolytic cell uses an external DC source to force a non-spontaneous reaction (ele …