A) \[Ni{{(CO)}_{4}}\]has zero oxidation number for\[Ni\]
B) \[Ni{{(CO)}_{4}}\]has oxidation number\[+4\]for\[Ni\]
C) \[Ni\]is metal
D) \[CO\]is gas
Correct Answer: B
Solution :
In\[[Ni{{(CO)}_{4}}]\],\[Ni\] has zero oxidation number.
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