Question

Which of the following is wrong statement?

• A. $Ni(CO)_{4}$ has oxidation number $+4$ for $Ni$
• B. $Ni(CO)_{4}$ has zero oxidation number for $Ni$
• C. $Ni$ is metal
• D. $CO$ is gas

Answer 1

Answer: (A)

$Ni(CO)_{4}$ has oxidation number $+4$ for $Ni$

Answer 2

In $Ni ( CO )_{4}$, carbonyl group is a neutral species.
So oxidation number of $Ni$ is zero.
$Ni ( CO )_{4}$
$x+4 \times 0=0$
$x=0$