Among the following complexes (K–P), K_3[Fe(CN)_6] (K), [Co(NH_3)_6]Cl_3 (L), Na_3[Co(oxalate)_3] (M), [Ni(H_2O)_6]Cl_2 (N), K_2[Pt(CN)_4] (O) and [Zn(H_2O)_6](NO_3)_2 (P) the diamagnetic complexes are

JEE Advanced 2011 Chemistry question

Among the following complexes (K–P), (K), (L), (M), (N), (O) and (P) the diamagnetic complexes are

(A)K, L, M, N
(B)K, M, O, P
(C)L, M, O, PCorrect
(D)L, M, N, O

Answer: (C)

Solution

K: () with strong-field is low spin , one unpaired electron: paramagnetic. L: () with is low spin : diamagnetic. M: () with oxalate is also low spin : diamagnetic. N:

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Question ID VK-025945