Class 12 NEET Chemistry D And F Block Elements Questions

Ti3+(Z=22)
Ions which have unpaired electrons exhibit colour in solution.
Ti3+ has an outer electronic configuration of 4s03d1, i.e.,
1 unpaired electron
Thus its solution will be coloured
Sc3+→d0.
In case of La3+,4f0 configuration is present and in Lu3+,4f14 is present,So,there is no possibility of f - f transition, hence these ions do not appear coloured.