ICSE Class 10 Answered

Oxidation: When an atom or ion loses electron or electrons, oxidation takes place.

      e.g.,                                        Na – e– Na+ 

                                                  Fe2+ – e– Fe3+

Reduction: When an atom or ion gains an electron or electrons reduction takes place.

      e.g.,                               Cl + e–   Cl–

                                               Cu2+ + 2e– Cu