Which one of the following is not arragned in the correct sequence?
1
d5 > d3 > d1 , –increasing magnetic moment
2
MO2, M2O3, MO2, M2O5–decreasing basic strength
3
Sc, V, Cr, Mn–increasing number of oxidation states
4
Co3+, Fe3+, Cr3+, Sc3+–increasing stability