REDOX:electron transfere from one atom to another.
OX. NO:no of charge appear on the atom when it is in a compound.
REDOX POT: the driving force for the electron.
بصراحة معرفش تعريف electrode potential
اعتقد حسب اللي انا فاهماه ان Mno-4 has E=1.5v while Fe+2 e= 0.77v so Mno-4s easily oxidized to take electron from fe+2