Among the following complexes : `K_(3)[Fe(CN)_(6)],[Co(NH_(3))_(6)]Cl_(3)` , `Na_(3)[Co ( o x )_(3)],[Ni(H_(2)O)_(6)]Cl_(2)`, `K_(2)[Pt(CN)_(4)]` and `[Zn(H_(2)O)_(6)(NO_(3))_(2)]`
The diamagnetic are .

Options

A. K, L, M, N
B. K, M, O, P
C. L, M, O, P
D. L, M, N, O

Answer

C

Explanation

K: `K_(3)|Fe(CN)_(6)|, Fe^(3+)= 3d^(5), dsp^(3)` hybridisation
numbre of unpaired electrons = 1 parmagnetic
L : `|Co(NH_(3))_(6)|Cl_(3), Co^(3+) = 3d^(6), dsp^(3)` hybridisation
number of unpaired electrons = 0 diamagnetic
M : `Na_(3)|Co(o xalate)_(3)|, Co^(3+) = 3d^(6), d^(2)sp^(3)` hybridisation
number of unpaired electron = 0 diamagnetic
N : `|Ni(H_(2)O)_(6)|Cl_(2), Ni^(2+) = 3d^(8), sp^(3)d^(2)` hybridisation
number of unpaired electrons = 2 paramagnetic
O : `K_(2)|Pt(CN)_(4)|, Pt^(2+) = 5d^(8), dsp^(2)` hybridisation
number of unpaired electrons = 0 diamagnetic
P : `|Zn(H_(2)O)_(6)|(NO_(3))_(2), Zn^(2+) = 3d^(10), sp^(3)d^(2)` hybridisation
number of unpaired electron = 0
`:.` diamagntic complexes are L,M, O and P.