State the $IUPAC$ name of the following complex: $[Cr(C_2O_4)_3]^{3-}$

The oxidation state of $Cr$ in $[Cr(NH_3)_6]Cl_3$ is .......

$IUPAC$ name of the complex $K_3[Al(C_2O_4)_3]$ is:

Which of the following is correctly matched?
Compound $\rightarrow$ $O.S.$ of $C.M.I.$

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

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 $(III)$