Write the IUPAC names of the following coordination compounds:
(a)`[Pt(NH_(3))_(2)Cl(NO_(2))]`
(b) `K_(3)[Cr(C_(2)O_(4))_(3)]`
(c) `[CoCl_(2)(en)_(2)]Cl`
(d) `[Co(NH_(3))]Cl`
(e) `Hg[Co(SCN)_(4)]`

Explanation

(a) Diammine chlorid onitrito-N-platinum (II)
(b) Potassium trioxalatochromate (III)
(c) Dichloridobis (ethane -1,2-diamine) cobalt (III) chloride
(d) Pentaammine carbonato cobart (III) chloride
(e) Mercury (I) tetrathio cyanato -S- cobaltate (III)