(ii) The metal complex ion that is paramagnetic is:

(Atomic number of Fe = 26, Cu = 29, Co = 27 and Ni = 28)

(a) [Fe(CN)₄]^2-
(b) [Co(NH₃)₆]³⁺
(c) [Ni(CN)₄]^2-
(d) [Cu(NH₃)₄]²⁺

Solution