A) + 2
B) - 2
C) 0
D) 4
Correct Answer: B
$ {{[,Ni,{{(CN)}_4},]}^{x}} $ , $ (,Ni=+2,) $
$ (,CN=-1,) $
$ x=2+4(-1) $
$ \Rightarrow $
$ x=-2 $ .
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