Coordination CompoundHard

Question

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)

Options

A.[Co(NH3)6]Cl3
B.[CoCl2(NH3)4]Cl
C.[CoCl3(NH3)3]
D.[CoCl(NH3)5]Cl2 

Solution


n(AgCl) = x n(CoCl3. 6NH3)
         ∴ x = 3
∴ The complex is [Co(NH3)6]Cl3

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