Give the formula of each of the following coordination entities :
(i) `Co^(3+)` ions is bound to one `Cl^(-)` one `NH_(3)` molecules and two bidentate ethylene diamine (en) molecules.
(ii) `Ni^(2+)` ions is bound to two water molecules and two oxalate ions.
Write the name and magnetic behaviour of each of the abvoe coordination entities.
(At. nos. `Co = 27, Ni = 28`)

Explanation

(i) `[Co(NH_(3))(en)_(2)Cl]^(+2)`
IUPAC name : Amminechlorid (ethane, -1,2-diamine) Cobalt III ion.
Magnetic beaviour : diamagnetic `(d^(2)sp^(3))` hybridisation
(ii) `[Ni(H_(2)O)_(2)(C_(2)O_(4))_(2)]^(2-)`
IUPAC name : Diaquadioxalationnickelate (II) ion.
Magnetic behaviour : Paramagnetic `(sp^(3)d^(2))` hybridisation.