Answer: According to Classical or earlier concept oxidation is a process which involves the addition of oxygen or any electronegative element or the removal of hydrogen or any electropositive element.
According to electronic concept oxidation is defined as the process in which an atom or ion loses one or more electrons.
According to Classical or earlier concept reduction is a process which involves the addition of hydrogen or any electropositive element or the removal of oxygen or any electronegative element.
According to electronic concept reduction is defined as the process in which an atom or ion gains one or more electrons.