$[Fe(N_3)(O_2)(SCN)_4]^{4-}$ is named as

What is the oxidation state of $Fe$ in $Fe(CO)_5$?

Write the formulas for the following coordination compounds:
$(a)$ Tetraammineaquachloridocobalt $(III)$ chloride
$(b)$ Potassium tetrahydroxidozincate $(II)$
$(c)$ Potassium trioxalatoaluminate $(III)$
$(d)$ Dichloridobis(ethane$-1,2-$diamine)cobalt $(III)$
$(e)$ Tetracarbonylnickel $(0)$

The correct formula of diammine dichlorodicyano chromate $(III)$ is

The $IUPAC$ name of $[Co(NH_3)_4 Cl(NO_2)] Cl$ is

The $IUPAC$ name of the following complex is $[Co(NH_2 CH_2 CH_2 NH_2)_2 Br_2] Br$.