Which of the following is an incorrect $IUPAC$ name?

The oxidation state of iron in $K_{4}[Fe(CN)_{6}]$ is

Which of the following compounds has an oxidation state of $+3$ for iron?

Identify the pair of compounds in which both metal atoms are in their maximum oxidation state.

$IUPAC$ name of $[Co(NH_3)_5NO_2]Cl_2$

Using $IUPAC$ norms,write the formulas for the following:
$(i)$ Tetrahydroxozincate $(II)$
$(ii)$ Potassium tetrachloridopalladate $(II)$
$(iii)$ Diamminedichloridoplatinum $(II)$
$(iv)$ Potassium tetracyanonickelate $(II)$
$(v)$ Pentaamminenitrito$-O$-cobalt $(III)$
$(vi)$ Hexaamminecobalt $(III)$ sulphate
$(vii)$ Potassium tri(oxalato)chromate $(III)$
$(viii)$ Hexaammineplatinum $(IV)$
$(ix)$ Tetrabromidocuprate $(II)$
$(x)$ Pentaamminenitrito$-N$-cobalt $(III)$