In the following species, how many species have same magnetic moment?

(i) $ \mathrm{Cr}^{2+} $ (ii) $ \mathrm{Mn}^{3+} $ (iii) $ \mathrm{Ni}^{3+} $ (iv) $ \mathrm{Sc}^{2+} $ (v) $ \mathrm{Zn}^{2+} $ (vi) $ \mathrm{V}^{3+} $ (vii) $ \mathrm{Ti}^{+} $

Which of the following is not a mixed pair of oxides?