Which of the following complex ions/molecules of nickel is paramagnetic?

In [Ni(NH)3)4]2+, NH3 is weak ligand and the d8 configuration of Ni+2 has two unpaired electrons. 76. Which of the following statements is incorrect? (a) Most of the four-coordinated complexes of Ni2+ ion are square planar rather than tetrahedral. (b) The [Fe(H2O)6]3+ ion is more paramagnetic than the [Fe(CN)6]3– ion. (c) Square planar complexes are more stable than octahedral complexes. (d) The [Fe(CN)6]4– ion is paramagnetic but [Fe(CN)6]3– is diamagnetic. The [Fe(CN)6]4– ion is paramagnetic but [Fe(CN)6]3– is diamagnetic (wrong). [Fe(CN)6]3– due to unpaired e-. So it is paramagnetic. CO