One mole of the octahedral complex compound gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with excess of solution to yield two moles of . The structure of the co

Question

One mole of the octahedral complex compound  gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with excess of  solution to yield two moles of . The structure of the complex is:

(a) 
(b) 
(c) 
(d)

Canvas Classes · Accepted Answer

🧠 Werner Test: Inner vs Outer Cl⁻

For  (empirical):
- Total ions in solution: 3 → 1 cation + 2 anions (or vice versa).
- AgCl precipitate: 2 mol per 1 mol complex → 2 outer-sphere Cl⁻.

🗺️ Build Inner Sphere

- 5 NH₃ + 1 Cl⁻ inner = 6 (octahedral). Outer = 2 Cl⁻.
- Formula: .
- Co OS:  (cation charge) → . ✓ Co(III).

🗺️ Verify

-  → 3 ions total ✓
- 2 outer Cl⁻ → 2 mol AgCl on AgNO₃ addition ✓

🗺️ Eliminate Other Options

- (b) : Outer-sphere NH₃ is unusual; non-standard.
- (c) : Gives 1 mo

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