The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a…
The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is
$\mathrm{Mn}^{2+}$
$\mathrm{Cr}^{3+}$
$\mathrm{Ni}^{2+}$
$\mathrm{Ti}^{3+}$
Solution
$\mathrm{Ni}^{2+}$ gives violet colour with borax bead test in nonluminous flame under hot conditions. $\mathrm{Ni}^{2+}$ has $\mathrm{d}^8$ configuration which does not depend on nature of ligand present in octahedral field. $\mathrm{Ni}^{2+} \Rightarrow \mathrm{t}_{2 g}^6 \mathrm{eg}^2$