A) - 2
B) - 1
C) + 2
D) 0
Correct Answer: D
Solution :
\[{{K}_{4}}[\overset{*}{\mathop{Ni}}\,{{(CN)}_{4}}]\] \[4\times (+1)+x+4\times (-1)=0\] \[+4+x-4=0\Rightarrow x=0\].
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