Which of the following statements is incorrect?
- AThe oxidation state of $Ni$ in $Ni(CO)_4$ is $+4$.
- BThe oxidation state of $Ni$ in $Ni(CO)_4$ is zero.
- C$Ni$ is a metal.
- D$CO$ is a gas.
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Write the formulas for the following coordination compounds:
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$(d)$ Dichloridobis(ethane$-1,2-$diamine)cobalt $(III)$
$(e)$ Tetracarbonylnickel $(0)$
$(a)$ Tetraammineaquachloridocobalt $(III)$ chloride
$(b)$ Potassium tetrahydroxidozincate $(II)$
$(c)$ Potassium trioxalatoaluminate $(III)$
$(d)$ Dichloridobis(ethane$-1,2-$diamine)cobalt $(III)$
$(e)$ Tetracarbonylnickel $(0)$
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