1.

Cobalt (III) chloride forms several octahedral complexes with amonia. Which of the following will not give test for chloride ions with silver nitrate at `25^@C`?A. `CoCl_(3), 5NH_(3)`B. `CoCl_(3). 6NH_(3)`C. `CoCl_(3). 3NH_(3)`D. `CoCl_(3). 4NH_(3)`

Answer» Correct Answer - C
All the complexes are of octahedral nature which means that the `Co^(3+)` ion has six ligands attached to it in the co-ordination sphere. The complex `CoCl_3.3NH_3` will not give any white precipitate with silver nitrate solution since it has no free `Cl^(-)` ions present in the ionisation sphere.


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