NEET-XII-Chemistry
Previous Year Paper year:2018
- #84Which one of the following ions exhibits d-d
transition and paramagnetism as well ?
(1) ``CrO^{2-}_4``
(2) ``Cr_2O^{2-}_7``
(3) ``MnO_4^{-}``
(4) ``MnO_4^{2-}``digAnsr: 4Ans : (4)
Sol. CrO4-2 Cr+6 diamagnetic
Cr2O7
-2 Cr+6 diamagnetic
MnO4
- Mn+7 diamagnetic
MnO4
-2 Mn+6 paramagnetic
unpaired electron is present so d-d transition is
possible.
Before
transition
After
transition