Which one of the following statements is not correct?
- ANickel forms $Ni(CO)_4$
- BAll the transition metals form monometallic carbonyls
- CCarbonyls are formed by transition metals
- DTransition metals form complexes
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What is the oxidation state of the metal in metal carbonyls?
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$\underset{I}{[Co_2(CO)_8]} \quad \underset{II}{[Fe_3(CO)_{12}]} \quad \underset{III}{[Mn_2(CO)_{10}]} \quad \underset{IV}{[Fe_2(CO)_9]}$
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