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Among the following ions, which one has ...

Among the following ions, which one has the highest paramagnetism ?

A

`[Cr(H_(2)O)_(6)]^(3+)`

B

`[Zn(H_(2)O)_(6)]^(2+)`

C

`[Cu(H_(2)O)_(6)]^(2+)`

D

`[Fe(H_(2)O)_(6)]^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
D
Water is a weak-field ligand, so the crystal field splitting `(Delta)`is smaller than spin-pairing energy. Hence, electrons are not paired in lower energyd-orbitals (i.e., no pairing of electrons in d-orbitals occurs against the Hunds rule).

The more the number of unpaired electrons, the higher is the paramagnetic character of the metal ion. As a result, `[Fe(H_(2)O)_(6)]^(2+)` has the highest paramagnetism.
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