A solution containing 2.675 g of CoCl3. 6 NH3 (molar mass = 267.5 g mol–1) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of AgNO3 to give 4.78 g of AgCl (molar mass = 143.5 g mol–1). The formula of the complex is (At. Mass of Ag = 108 u)
(a) [Co(NH3)6]Cl3
(b) [CoCl2(NH3)4]Cl
(c) [CoCl3(NH3)3]
(d) [CoCl(NH3)5]Cl2
