Question

Different theories have been put forward to explain the geometrical of co-ordianation compounds. Out of them , the most practical is the valence bond theory which is based upon the concept of hybridisation . According to this , the complexes with C.N.4 may be either tetrahedral (`sp^(3)` hybridised ) or square planar (`dsp^(2)` hybridised ) in nature. Similarly , in the octahedral complexes , the metal atom or ion is either paramagnetic if one or more orbitals are half-filled and diamagnetic if all are filled in nature.
Which has the highest paramagnetic character ?
A. `[Cr(H_(2)O)_(6)]^(3+)`
B. `[Fe(H_2)O)_(6)]^(2+)`
C. `[Cu(H_(2)O)_(6)]^(2+)`
D. `[Zn(H_(2)O)_(6)]^(2+)`

Answer 1

Correct Answer - b
`Fe^(2+)` ion with maximum number of unpaired electrons (4) shows maximum para-magnesium in the complex `[Fe(H_(2)O)_6]^(2+)` .