Among the following ions which one has the highest paramagnetism?
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a
CrH2O63+
b
CuH2O62+
c
FeH2O62+
d
ZnH2O62+
answer is C.
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Detailed Solution
Larger the number of unpaired electrons, the more it has paramagnetism. The configuration of cr3+ (3d3) Fe2+ (3d6), Cu2+ (3d9) and Zn2+ (3d10) are outer orbital complex ions. Hence, Fe2+ has maximum unpaired electrons.