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