Coordination CompoundHard
Question
Among the following ions, which one has the highest paramagnetism ?
Options
A.[Cr(H2O)6]3+
B.[Fe(H2O)6]2+
C.[Cu(H2O)6]2+
D.[Zn(H2O)6]2+
Solution
(A) Cr3+, 3d3 
n = 3.
(B) Fe2+, 3d5
n = 5.
It has maximum number of unpaired electrons.
(C) Cu2+, 3d9
n = 0.
(D) Zn2+, 3d10
n = 0.
n = 3.
(B) Fe2+, 3d5
n = 5.
It has maximum number of unpaired electrons.
(C) Cu2+, 3d9
n = 0.
(D) Zn2+, 3d10
n = 0.
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