The oxidation states of iron atoms in compounds A , B and C , respectively, are x ,   y and z . Then sum of x ,   y and z is ........... Na 4 Fe CN 5 NOS A   Na 4 FeO 4 B   Fe 2 CO 9 C

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Oxidation state of Fe in Na 4 Fe CN 5 NOS : Charge of CN = - 1 Charge of NOS = - 1 Suppose oxidation state of Fe   =   x 4 + x - 5 - 1 = 0 ⇒ x = + 2 Oxidation state of Fe   in   Na 4 FeO 4 : 4 + x - 8 = 0 ⇒ x = + 4 Oxidation state of Fe   in   Fe 2 CO 9 = 0 because carbonyl is neutral ligand. The oxidation states of iron in these compounds will be A   =   + 2       B   =   + 4       C   =   0   The sum of oxid