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The correct order of the number of unpaired electrons in the given complexes is
A) ${[Fe {(CN)}_{6}]}^{3 -}$
B) ${[Fe F_{6}]}^{3 -}$
C) ${[Co F_{6}]}^{3 -}$
D) ${[Cr {(oxalate)}_{3}]}^{3 -}$
E) $[Ni {(CO)}_{4}]$
Choose the correct answer from the options given below:

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E<A<D<C<B

E<A<B<D<C

A<E<D<C<B

A<E<C<B<D

answer is B.

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Detailed Solution

${[{FeF}_{6}]}^{3 -} > {[{CoF}_{6}]}^{3 -} > {[Cr (oxalate)_{3}]}^{3 -} > {[Fe (CN)_{6}]}^{3 -} > [Ni (CO)_{4}]$

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