Solve this: Solve this: 140. Oxidation number of iron in Share with your friends Share 0 Vartika Jain answered this Dear Student, The charge on the coordination sphere will be -2 Na2[Fe(CN)5(NO)] = Na+[Fe(CN)5(NO)]2-So, oxidation number of Fe in [Fe(CN)5(NO)]2- can be calculated as :(oxidation number of Fe)+5(oxidation number of CN)+(oxidation number of NO)= Charge on coordination sphereor, oxidation number of Fe+5(-1)+1=-2or, oxidation number of Fe=-2+4or, oxidation number of Fe=+2Hence, oxidation number of iron is +2Therefore, correct answer is (1) 2 View Full Answer