Coordination CompoundHardBloom L2

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

Sol. H2O being a W.F.L.

Cr+3 = 3d3 ⇒ 3 unpaired electrons

Fe+2 = 3d6 ⇒ 4 unpaired electrons

Cu+2 = 3d9 ⇒ 1 unpaired electron

Zn+2 = 3d10 ⇒ 0 unpaired electron

No. of u.p.e increases ⇒ Paramagnetism increases

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