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B
is diamagnetic
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C
should be very stable
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D
has 2 unpaired electrons
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Solution
The correct option is C should be very stable In the given complex the oxidation state of iron is +3. The electronic configuration of iron in +3 oxidation state is 1s22s2p63s23p63d5. The compound has 1 unpaired electrons and exhibit octahedral geometry. It is a low spin complex and is very stable.