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