PYQ NEET- The F And D Block Elements L-9
Question: Which one of the following ions exhibits $\mathrm{d}$-d transition and paramagnetism as well?
A) $\mathrm{CrO}_4{ }^{2-}$
B) $\mathrm{Cr}_2 \mathrm{O}_7^{2-}$
C) $\mathrm{MnO}_4^{-}$
D) $\mathrm{MnO}_4{ }^{-}$