Using IUPAC norms, write the formulae for the following:

Using IUPAC norms, write the formulae for the following:
(i) Potassium tri(oxalato) chromate (III)
(ii) Hexaammine platinum (IV)
(iii) Tetrabromidocuprate (II)
(iv) Pentaamminenitrito-N-cobalt (III)