Which of the following complexes will show geometrical isomerism?

Which of the following complex ions has a magnetic moment same as $[Cr(H_2O)_6]^{3+}$?

Which one of the following pairs of isomers and types of isomerism are correctly matched?
$(i).$ $[Co(NH_3)_5(NO_2)]Cl_2$ and $[Co(NH_3)_5(ONO)]Cl_2$ .... (Linkage)
$(ii).$ $[Cu(NH_3)_4][PtCl_4]$ and $[Pt(NH_3)_4][CuCl_4]$ .... (Coordination)
$(iii).$ $[PtCl_2(NH_3)_4]Br_2$ and $[PtBr_2(NH_3)_4]Cl_2$ .... (Ionization)
Select the correct answer using the codes given below.

The magnetic moment (spin only) of $[NiCl_{4}]^{2-}$ is ....... $B.M.$

Which of the following is paramagnetic?

The number of possible isomers for the square planar complex $K_2[PdClBr_2SCN]$ is .................