First slide

Aplicaitons of VBT

Question

Among the following ions which one has the highest paramagnetism?

Moderate

A

${[Cr {(H_{2} O)}_{6}]}^{3 +}$
B

${[Cu {(H_{2} O)}_{6}]}^{2 +}$
C

${[Fe {(H_{2} O)}_{6}]}^{2 +}$
D

${[Zn {(H_{2} O)}_{6}]}^{2 +}$

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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