Why Fe^3+ is more stable than Fe^2+ ?...

Why `Fe^3+` is more stable than `Fe^2+` ?

Text Solution

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The electronic configuration of `Fe, Fe^(2+) and Fe^(3+)` are shown below :
`Fe (Z = 26) = [ ar] 3d^(6) 4s^(2), Fe^(2+) = [Ar] 3d^(6) , Fe^(3+) = [Ar] 3d^(5)`
Here, the electronic configuration of `Fe^(3+)` is more stable (3d-orbitals are all half-filled)
Hence, `Fe^(3+)` is more stable than `Fe^(2+)`

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Knowledge Check

When Fe metal is rusted then Fe is:

A

Oxidised

B

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D

Precipitated

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