The correct order of the stoichiometries of `AgCl` formed when `AgNO_3` in excess is treated with the complexes: `CoCl_(3).6NH_3, CoCl_(3).5NH_3, CoCl_(3). 4NH_3` respectively is:

Options

A. 1 AgCI, 3 AgCI, 2 AgCI
B. 3 AgCI, 1 AgCI, 2 AgCI
C. 3 AgCI, 2 AgCI, 1 AgCI
D. 2 AgCI, 3 AgCI, 1 AgCI

Answer

C

Explanation

According to Werner's theory
`CoCl_(3)·6NH_(3)to[Co(NH_(3) )_(6) ]^(3+)3Cl^(-)`
`CoCl_(3)·5NH_(3)to[Co(NH_(3) )_(5)Cl]^(2+)2Cl^(-)`
`CoCl_(3)·4NH_(3)to[Co(NH_(3) )_(4)Cl_(2)]^(+)Cl^(-)`
When `AgNO_(3)` in excess is treated with these complexes then following reactions takes place :
`[Co(NH_(3))_(6)]^(3+)3Cl^(-)+underset(("Excess"))(AgNO_(3))to3AgCl+[Co(NH_(3))_(6)]^(3+)`
`[Co(NH_(3))_(5)Cl]^(2+)2Cl^(-)+underset(("Excess"))(AgNO_(3))to2AgCl+[Co(NH_(3))_(5)Cl]^(2+)`
`[Co(NH_(3))_(4)Cl_(2)]^(+)2Cl^(-)+underset(("Excess"))(AgNO_(3))toAgCl+[Co(NH_(3))_(4)Cl_(2)]^(+)`