1.

Calculate the oxidation state of a metal in the following complexes :(a) [Fe(NH3)6](NO3)3(b) Ni(CO)5.

Answer»

(a) [Fe(NH3)6](NO3)3 ⇌ [Fe(NH3)6]3+ + 3NO3-

NH3 is a neutral ligand, and the charge number of complex ion is + 3. 

If the oxidation state of Fe is x then,

+ 3 = x + 6(0) 

∴ x = + 3 

∴ The oxidation state of Fe is +3.

(b) Ni(CO)5 is a neutral complex and CO is a neutral ligand. 

If the oxidation state of Ni is x, then 

zero = x + 5 x (zero) 

∴ x = zero. 

The oxidation state of Ni is zero.



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