Oxidation number of Cobalt in \( \mathrm{K}\left[\mathrm{Co}(\mathr...

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Oxidation number of Cobalt in \( \mathrm{K}\left[\mathrm{Co}(\mathrm{CO})_{4}\right] \) is :-
(1) \( +1 \)
(2) \( -1 \)
(3) 0
(4) \( +2 \)
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