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Topic: Werner's theory, ligands, coordination number, denticity, chelation· Coordination Compounds

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 :

1. 3 AgCl, 1 AgCl, 2 AgCl

2. 3 AgCl, 2 AgCl, 1 AgCl

3. 2 AgCl, 3 AgCl, 1 AgCl

4. 1 AgCl, 3 AgCl, 2 AgCl

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Best answer

Answer: 2. 3 AgCl, 2 AgCl, 1 AgCl

Key idea: only ionisable (outside the coordination sphere) chloride precipitates with \(\mathrm{AgNO_3}\).

  • \(CoCl_3\cdot6NH_3 = [Co(NH_3)_6]Cl_3\): 3 \(\mathrm{Cl^-}\) free, 3 AgCl.
  • \(CoCl_3\cdot5NH_3 = [Co(NH_3)_5Cl]Cl_2\): 2 AgCl.
  • \(CoCl_3\cdot4NH_3 = [Co(NH_3)_4Cl_2]Cl\): 1 AgCl.

Order: 3, 2, 1, option 2.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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