One mole of the coinplex compound `Co(NH_3)_5 Cl_3` gives three moles of ions on dissolution in water. One mole of the same complex reacts with two moles of `AgNO_3` solution to yield two moles of `AgCl(s)`. The structure of the complex is

Options

A. `[Cr(NH_3)_4 Cl]Cl_2. NH_3`
B. `[Cr (NH_3)_4 Cl_2] Cl.NH_3`
C. `[Cr(NH_3)_5Cl]Cl_2`
D. `[Cr(NH_3)_3 Cl_3].2 NH_3`

Answer

C

Explanation

`[Cr(NH_3)_5 Cl] Cl_2 overset(H_2O)(rarr) [Cr(NH_3)_5 Cl]^(2+) + 2Cl^(Theta)`
`2AgNO_3 + 2Cl^(Theta) to 2AgCl + 2NO_3^(Theta)`