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Question

Fe3+compounds are more stable than Fe2+ compounds because:

A
Fe3+ has smaller size than Fe2+
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B
Fe3+ has 3d5 configuration (half-filled)
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C
Fe3+ has higher oxidation state
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D
Fe3+ is paramagnetic in nature
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Solution

The correct option is A Fe3+ has 3d5 configuration (half-filled)
Stability depends on the electronic configurations of respective ions/elements.
Fe+3 has an electronic configuration of [Ar]3d54s0 and
Fe+2 has an electronic configuration of [Ar]3d64s0,Fe+3 being half filled is more stable thanFe+2 which is incompletely filled.

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