Q18 / 200 · Manipal (MET) 2012 · Chemistry

The oxidation number of cobalt in $\mathrm{K}\left[\mathrm{Co}(\mathrm{CO})_4\right]$ is

Correct answer
A
-1
B
-3
C
+1
D
+3

Solution

$\begin{aligned} \mathrm{K}\left[\mathrm{Co}(\mathrm{CO})_4\right] \\ & +1+x+0 \times 4=0\end{aligned}$ $\therefore \qquad x=-1$

Hence, the correct answer is option: 'A'.

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