A) \[Mn{{O}_{2}},\,\,\,FeC{{l}_{3}}\]
B) \[{{\left[ Mn{{O}_{4}} \right]}^{-}},\,\,\,\,Cr{{O}_{2}}C{{l}_{2}}\]
C) \[{{\left[ FeCN{{)}_{6}} \right]}^{3-}},\,\,\,\left[ Co{{(CN)}_{3}} \right]\]
D) \[{{\left[ Nic{{l}_{4}} \right]}^{2-}},\,\,\,{{\left[ Co{{(Cl)}_{4}} \right]}^{-}}\]
Correct Answer: B
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