What is the magnetic moment of $[FeF_6]^{3-}$ (in $BM$)?

Match List-$I$ with List-$II$ :

List-$I$	List-$II$
$(a).$ $[Co(NH_3)_6][Cr(CN)_6]$	$(i).$ Linkage isomerism
$(b).$ $[Co(NH_3)_3(NO_2)_3]$	$(ii).$ Solvate isomerism
$(c).$ $[Cr(H_2O)_6]Cl_3$	$(iii).$ Coordination isomerism
$(d).$ $cis-[CrCl_2(ox)_2]^{3-}$	$(iv).$ Optical isomerism

Choose the correct answer from the options given below:

Which of the following exhibit ionization isomerism?
$I) [Cr(NH_3)_4Cl_2]Cl$
$II) [Ti(H_2O)_5Cl](NO_3)_2$
$III) [Pt(en)(NH_3)Cl]NO_3$
$IV) [Co(NH_3)_4(NO_3)_2]NO_3$

Which of the following complex compounds will exhibit highest paramagnetic behaviour?
(At. No. $Ti = 22, Cr = 24, Co = 27, Zn = 30$)

If $n$ is the number of unpaired electrons,then the magnetic moment $(B.M.)$ of a transition metal/ion is given by:

The magnetic moment (spin-only) of $[NiCl_4]^{2-}$ is ........ $B.M.$