Calculate the number of unpaired electrons in the following gaseous ions : $(i)Mn^{3+} (ii) Cr^{3+} (iii) V^{3+} (iv) Ti ^{3+} $ Which one of these is most stable in aqueous solutions ?

Question

$\begin{array}{1 1}(A)\;Cr^{3+}\\(B)\;Mn^{3+}\\(C)\;V^{3+}\\(D)\;Ti^{3+}\end{array} $