A) +2
B) +3
C) +4
D) Zero
Correct Answer: A
$ \underset{+1}{\mathop{K_4}},[\underset{x}{\mathop{Fe}},{{(\underset{-1}{\mathop{CN}},)}_6}] $
$ 4+x-6=0 $
$ x=6-4 $
$ x=+2 $ .
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