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`)