(B) The complex is $[Ni(CN)_4]^x$. In this complex,the oxidation state of $Ni$ is typically $+2$. The charge on the ligand $CN^-$ is $-1$. The total c

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(B) The complex is $[Ni(CN)_4]^x$. In this complex,the oxidation state of $Ni$ is typically $+2$. The charge on the ligand $CN^-$ is $-1$. The total charge $x$ on the complex is the sum of the oxidation states of the central metal atom and the ligands: $x = (+2) + 4(-1)$ $x = 2 - 4$ $x = -2$ Therefore,the correct option is $(B)$.