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Atomic and Ionic Sizes of Lanthanides

Which ion wil...

Question

Which ion will show more paramagnetic behaviour ?

Ag⁺

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Fe ³⁺

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Cu⁺

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Fe ²⁺

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Solution

The correct option is B
Fe ³⁺

A species is more paramagnetic when it contains the more number of unpaired electrons from the other. Fe ³⁺ has 5 unpaired electrons (Electronic configuration of 3d⁵) than Fe ^{2 +} (electronic configuration 3d⁶) having four unpaired electrons while Cu⁺ =3d¹⁰,4s⁰and Ag⁺ =4d¹⁰,5s⁰ has completely filled d orbitals so are not paramagnetic.

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