The oxidation number of cobalt in $K[Co(CO)_4]$ is:

  • A
    $+1$
  • B
    $+3$
  • C
    $-1$
  • D
    $-3$

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Provide the $\text{IUPAC}$ nomenclature for the following coordination compounds:
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The $IUPAC$ name of ${K_2}[Cr(CN)_2(O_2)(O)_2(NH_3)]$ is

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