Which one of the following ions exhibits d-d transition and paramagnetism as well?
Correct answer: D. MnO42-
- A. MnO4-
- B. CrO42-
- C. Cr2O72-
- D. MnO42-
Explanation
The correct answer is MnO42-, where manganese is in the +6 oxidation state. In this state, manganese retains d electrons, making d-d transitions possible. Moreover, the presence of unpaired electrons in the d orbitals results in paramagnetism.The other options, MnO4-, CrO42-, and Cr2O72-, have their respective metal ions in oxidation states where no d electrons are present (Mn⁷⁺ and Cr⁶⁺). Consequently, these ions cannot exhibit d-d transitions and are not paramagnetic.
Last updated
About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
Practise Transition Elements
531 free Transition Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
1st series of transition elements start from?
3d-series of transition elements contains elements in the range from:
A transition element is best defined as one that
Acidified potassium permanganate acts as a strong oxidising agent and in doing so the purple manganate seven ion is reduced to
Across the first transition series from scandium to zinc, the atomic radius