Which pair of ions have the same magnetic moment?

Which element from the following in $+2$ oxidation state exhibits the highest magnetic moment?

Which of the following is more paramagnetic?

The elements belonging to the first transition series have atomic numbers from

Which of the following has the maximum number of unpaired electrons?
(Atomic numbers: $Fe=26, Co=27, Mn=25, Cr=24$)

Determine whether the following statements are True $(T)$ or False $(F)$:
$(a)$ The atomic radii of the elements of the second transition series $(4d)$ are larger than those of the first transition series $(3d)$.
$(b)$ $Cr^{+}$,$Mn^{2+}$,and $Fe^{3+}$ have the same electronic configuration.
$(c)$ $Cr^{+}$,$Mn^{2+}$,and $Fe^{3+}$ have the same $d^5$ electronic configuration.