A solution containing 2.675 g of CoCl3 ....

A solution containing 2.675 g of `CoCl_3 .6NH_3` (molar mass = 267.5 g `mol^-1`) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of `AgNO_3` 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)

`[CoCl_3(NH_3)_3]`

`[CoCl(NH_3)_5]Cl_2`

`[Co(NH_3)_6]Cl_3`

`[CoCl_2(NH_3)_4]Cl`

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