Which of the following pairs will have the same effective magnetic moment?

Identify the element for which the electronic configuration in the $+3$ oxidation state is $[Ar] 3d^5$:

The transition metal having the highest $3^{rd}$ ionisation enthalpy is:

Which of the following statements is correct regarding the ions $Zn^{2+}$,$Ni^{2+}$,and $Cr^{3+}$? (Atomic numbers: $Zn = 30$,$Ni = 28$,$Cr = 24$)

Determine whether the following statements are True $(T)$ or False $(F)$:
$(a)$ An element or its ion that does not have a completely filled $d$-orbital is considered a transition element.
$(b)$ $Sc$ is a transition element.
$(c)$ $Zn$ is a transition element.
$(d)$ The energy difference between $(n-1)d$ and $ns$ orbitals is high.

Among $Sc$,$Mn$,$Co$ and $Cu$,identify the element with the highest enthalpy of atomisation. The spin-only magnetic moment value of that element in its $+2$ oxidation state is $......... \text{BM}$ (in nearest integer).